PEPPER HAMILTON LLP

                                                                Robert B. Murphy
                                                       direct dial: 202.220.1454
                                                           murphyr@pepperlaw.com

                                  June 17, 2005

VIA EDGAR

Mark P. Shuman
Branch Chief - Legal
United States Securities and Exchange Commission
450 Fifth Street, N.W.
Washington, DC 20549

                 Re: VASCO Data Security International, Inc.
                     Form S-3 filed April 29, 2005
                     Registration No. 333-124458

                     Form 10-K filed March 31, 2005
                     File No. 0-24389

Dear Mr. Shuman:

          On behalf of VASCO Data Security International, Inc. (the "Company"),
we are hereby responding to comments by the staff (the "Staff") of the Division
of Corporation Finance contained in your letter dated May 26, 2005 (the "Comment
Letter"), in connection with the above-captioned registration statement (the
"Registration Statement") and annual report (the "Form 10-K"). For the
convenience of reference, each of the Staff's comments are reproduced below
under the Staff's topics headings followed in each case by the related Company
response.

FORM S-3
GENERAL

     1.   We note that you have just filed an amended Form 8-K that includes a
          signed opinion of the auditors. But that Form 8-K amendment was not
          filed within 71 days after the date of the initial Form 8-K announcing
          the acquisition was required. Please provide your analysis concerning
          the effect of your apparent failure to file the BERK Accountants'
          report on a timely basis. Why do you



Mark P. Shuman
June 17, 2005
Page 2


          believe you comply with Instruction A(3)(b) to Form S-3, which
          requires timely filing of all required Exchange Act reports for the
          prior twelve calendar months prior to the filing of your registration
          statement.

     RESPONSE:

          The Company was proceeding under the belief that the Form 8-K/A filing
          that it made on April 20, 2005 was complete in all respects. The
          Company handled the Form 8-K/A filing with its financial printer who
          Edgarized and transmitted the filing. It appears from our review of
          the circumstances surrounding the transmission of the filing that the
          individual file containing the single page opinion was inadvertently
          dropped from the version of the filing sent to the printer. The
          Company was unaware of this until the Staff brought it to our
          attention in a phone call with the undersigned regarding the Staff's
          review of the Registration Statement. Upon confirmation of the dropped
          file, the Company promptly filed an additional Form 8-K/A, including a
          currently dated accountant's consent, with the signed opinion. Its
          instructive to note that a dated accountant's consent referencing the
          opinion was filed with the original Form 8-K/A demonstrating the good
          faith effort by the Company to meet its filing obligations and
          preserve its Form S-3 eligibility.

          The Company believes that the inadvertent dropping of the opinion File
          did not negatively affect the public interest nor the protection of
          investors and should not disqualify its eligibility for using Form
          S-3. In this regard, the audited financial statements and accountant's
          consent were timely filed and provided the investing public with the
          material information upon which they could make informed investment
          decisions. Further, the inadvertent dropping of the opinion itself
          would not constitute a "material" omission under the concept of
          materiality presented by the Supreme Court in TSC Industries Inc. v.
          Northway Inc., 426 U.S. 438 (1976), where in the Court stated that an
          omitted fact is material if it would have assumed actual significance
          in a reasonable person's deliberations.

          The Company respectively submits that disqualifying it from
          eligibility to use Form S-3 would amount to a severe penalty for the
          inadvertent dropping of the opinion page and would impose a severe
          hardship on the Company.



Mark P. Shuman
June 17, 2005
Page 3


ACCOUNTING
GENERAL

     2.   Please note the updating requirements of Rule 3-12 of Regulation S-X.

     RESPONSE:

          The Company will comply with the updating requirements of Rule 3-12 of
          Regulation S-X in connection with any further amendments to the
          Registration Statement.

FORM 10-K FOR THE FISCAL YEAR ENDED DECEMBER 31, 2004

MANAGEMENT'S DISCUSSION & ANALYSIS (MD&A) OF FINANCIAL CONDITION AND RESULTS OF
OPERATIONS

CRITICAL ACCOUNTING POLICIES AND ESTIMATES, PAGES 26 TO 27

     3.   Supplementally explain how you considered SEC Release 33-8350 in
          determining whether or not a discussion of the Company's revenue
          recognition policy as a critical accounting policy was necessary.
          Please keep in mind that your critical accounting policies and
          estimates discussion should serve as a supplement to the financial
          statement footnotes and describe how estimates and related assumptions
          were derived, how accurate the estimates and assumptions have been in
          the past, and whether the estimates and assumptions are reasonably
          likely to change in the future. They should also provide quantitative
          as well as qualitative information when information is reasonably
          available.

     RESPONSE:

          Management does not believe that a discussion of the revenue
          recognition policy is needed to satisfy any of the three principal
          objectives of SEC Release 33-8350. Management's thoughts relative to
          the three objectives are as follows:

          a.   "...enables investors to see the company through the eyes of
               management": The vast majority of our revenue, over 92% in 2004,
               is generated from the shipment of security hardware ("Tokens")
               and there is little judgment involved in applying our policy. The
               Company's policies are generally consistent with other companies
               whose revenues are derived from the



Mark P. Shuman
June 17, 2005
Page 4


               shipment of product (i.e., revenue recognized when product is
               shipped, title passes to buyer, and the Company has fulfilled all
               of its performance obligations). The key component that is viewed
               "through the eyes of management" is related to establishing
               proper internal controls related to ensuring proper cutoffs,
               which controls are discussed in Items 9 and 9A of the Form 10-K.

               The other aspect of revenue recognition that may be viewed
               "through the eyes of management" relates to multiple element
               arrangements, however, such transactions are not significant in
               total and accordingly, are not a focus of management in directing
               the business day-to-day. As discussed, the token component of
               such agreements is the most significant component of the
               transaction. See the answers to question 7 below, which discusses
               the significances of revenues by type of revenue, and question 9
               below related to multiple element arrangements.

          b.   "... to enhance the overall financial disclosure and provide the
               context within which financial information should be analyzed":
               Disclosure of revenue recognition polices for areas other than
               the shipment of product, which may be less consistent among
               company's filing annual reports on Form 10-K, are included in the
               footnotes to the financial statements. Also, since there are no
               critical accounting estimates involved with the revenue
               recognition policy, there is nothing for the investor to consider
               within the context of analyzing the financial information.

          c.   "...to provide information about the quality of, and potential
               variability of, a company's earnings and cash flow, so that
               investors can ascertain the likelihood that past performance is
               indicative of future performance": This section does not apply as
               the revenue recognition policy does not result in any material
               variability in the Company's earnings and cash flow. Even though
               the Company has a growing distributor/reseller network, those
               distributors do not hold any material amount of inventory. The
               Company's experience with the distributor/reseller network is
               that there is a short time period between the order being placed
               and the resulting distributors/reseller sale to their customer.
               We believe that the period is and will continue to be short as
               sales to distributors/resellers are final, with title passing to
               the distributor/reseller upon shipment, invoices being payable by
               the reseller in 30 days, and with no right of return.



Mark P. Shuman
June 17, 2005
Page 5


     4.   We note that you provide warranty and volume purchase discounts to
          customers. Supplementally explain how you considered the guidance in
          SEC Release 33-8098 to include a discussion of the methodology and
          assumptions underlying these estimates, the effect the accounting
          estimates have on the company's financial presentation, and the effect
          of changes in the estimates.

     RESPONSE:

          Neither warranty or volume purchase discounts involve assumptions that
          are "highly uncertain", as defined within SEC Release 33-8098, at the
          time of estimation. A discussion of each follows:

          a.   Warranty claims are monitored to determine the proper level of
               reserve needed. Given that our Tokens contain only a few
               components and the manufacturing is done on a contract basis with
               companies that produce high-quality electronic goods in large
               quantities, the Company has historically experienced minimal
               actual claims over the warranty period.

          b.   There is no estimate involved with volume purchase discounts. The
               Company negotiates specific prices for large orders that consider
               the quantity being purchased (described as a "volume-purchase
               discount" as generally the Company is willing to accept a lower
               per-unit price for higher quantities). The resulting purchase is
               for a fixed price and is supported by a firm, binding purchase
               order or contract wherein the contracted quantities are to be
               delivered over a specific period of time, which is generally less
               than 12 months.

ITEM 9A. CONTROLS AND PROCEDURES, PAGES 30-31

     5.   Your conclusion that the disclosure controls and procedures were
          effective to ensure that "material information relating to the company
          and its consolidated subsidiaries would be made known to them on a
          timely basis" addresses matters that are narrower in scope than the
          definition of "disclosure controls and procedures" in Rule
          13[a]-15(e). In your response letter, tell us whether you the
          conclusions concerning effectiveness were reached with respect to
          "disclosure controls and procedures" as defined in the referenced
          rule. In future filings, please ensure the conclusion concerning
          effectiveness conforms to the applicable definition. Also, clarify
          that the conclusion as to effectiveness is provided as of the end of
          the applicable financial statement period.



Mark P. Shuman
June 17, 2005
Page 6


     RESPONSE:

          The Company's management evaluated, with the participation of its
          principal executive and principal financial officers, the
          effectiveness of its disclosure controls and procedures as of the end
          of the period covered by the Form 10-K and concluded that its
          disclosure controls and procedures were effective to ensure that all
          information required to be disclosed in its reports filed with the
          Commission was recorded, processed, summarized and reported within the
          time period specified. In future filings, the Company will ensure that
          its conclusions in this regard conform with Rule 13a-15.

CHANGES IN INTERNAL CONTROLS

     6.   You indicate that there were no "significant" changes in internal
          controls during the quarter ended 2004. Please refer to Item 308(c) of
          Regulation S-K and note that you are required to report any changes in
          internal control over financial reporting that have materially
          affected or are reasonably likely to materially affect Vasco's
          internal controls over financial reporting. Please advise in this
          respect, and confirm that you will consider this comment in the
          preparation of future periodic reports.

     RESPONSE:

          There were no changes in the Company's internal controls over
          financial reporting identified in connection with its evaluation
          required by Rule 13a-15(d) during the fiscal quarter that has
          materially affected, or is reasonably likely to materially affect, its
          internal control over financial reporting. In future filings, the
          Company will ensure that its disclosures in this regard conform with
          Item 308(c).

FINANCIAL STATEMENTS
CONSOLIDATED STATEMENTS OF OPERATION, PAGE F-4

     7.   Supplementally explain how you considered the requirements of Rule
          5-03(b)(1) and (2) of Regulation S-X to disclose product and service
          revenues and their respective costs separately.



Mark P. Shuman
June 17, 2005
Page 7


     RESPONSE:

          The primary source of revenue is from the sale of Tokens. The
          secondary and tertiary sources of revenue are from the sale of
          software and services, respectively.

          The breakdown of revenues between the three categories in 2004 was
          approximately $27.7 million or 92.5% from the sale of Tokens, $1.5
          million or 4.8% from the licensing of software, and $0.8 million or
          2.6% from services and other sources of revenue. In 2003, the
          breakdown was 93% tokens, 4% software and 3% services/other. Software
          and service revenues, each being less than the 10%, are combined with
          Token revenue as permitted under Rule 5-03(b)(1) and (2).

NOTE 1:  SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, PAGES F-8 TO F-11
REVENUE RECOGNITION, PAGES F-8

     8.   We note your disclosures regarding your revenue streams such as
          license fees, support agreements and consulting and education
          services. Tell us whether you recognize revenue pursuant to SOP 97-2
          or SAB 104 and supplementally explain how you apply such guidance to
          each of your revenue streams.

     RESPONSE:

          Depending on the terms of the arrangements, VASCO recognizes revenue
          in accordance with either SOP 97-2 or SAB 104 when there is persuasive
          evidence that an arrangement exists, delivery has occurred, the fee is
          fixed or determinable and collectibility is probable. For transactions
          that include a software license, the Company records revenue in
          accordance with SOP 97-2. These criteria are applied to each revenue
          stream, whether as a single element or multiple-element arrangement
          and adherence to them is recorded and supported for each revenue
          transaction individually, as indicated below. Multiple element
          arrangements are discussed further in the Company's response to
          question number 9 below.

          Persuasive Evidence That an Arrangement Exists

          a.   Tokens and License Fees: our customary practice is that an
               arrangement exists if it is documented by a signed contract or
               purchase order from the customer.



Mark P. Shuman
June 17, 2005
Page 8


          b.   Support Agreements: arrangement exists is documented by a signed
               contract or purchase order from the customer.

          c.   Consulting and Education Services: arrangement is documented by a
               signed contract or purchase order.

          Delivery Has Occurred

          a.   Tokens and License Fees: VASCO ships all of its Tokens
               "Ex-Works", where risk of ownership passes to the buyer upon
               shipment from VASCO. This is evidenced by a shipping receipt
               document from the shipper. The delivery of software is evidenced
               either by a shipping document or the granting of a user license
               via our website.

          b.   Support Agreements: customer is notified that the support
               agreement is in place as evidenced by an electronic certificate.

          b.   Consulting and Education Services: evidenced by physically
               providing the contracted service.

          Vendor's Fee is Fixed or Determinable

          a.   Tokens and License Fees: all fees are initially based upon a
               price list. Final pricing is evidenced by a signed contract or
               purchase order.

          b.   Support Agreements: fees are based on a percentage of the
               software license price. Vendor specific objective evidence of
               fair value for support agreements is described in response to
               comment number 9 below.

          c.   Consulting and Education Services: fees are quoted from a price
               list and are usually negotiated. A signed contract or purchase
               order are evidence of a mutually agreed to price. Revenue from
               consulting or educational services is insignificant.

          Collectibility is Probable

          The ability for a customer to make payment is assessed for each
     contract or purchase order accepted by VASCO. VASCO will recognize revenue
     only if payment is expected to be made.



Mark P. Shuman
June 17, 2005
Page 9


     9.   Supplementally tell us if Company enters into multi-element
          arrangements. If so, tell us how you account for each element of the
          arrangement. Tell us how you determine VSOE or fair value in the
          arrangement and explain how you considered paragraph 10 of SOP 97-2
          and EITF 00-21, as applicable, in your accounting for multiple element
          arrangements.

     RESPONSE:

          VASCO does enter into arrangements to provide multiple products;
          security hardware (commonly referred to as Tokens), software, support
          agreements (post-contract customer support or "PCS") and consulting
          services. VASCO allocates fees to the various elements of the
          arrangements based on the estimated fair value of each component as
          required by SOP 97-2 and EITF 00-21. The fair value for each element
          is based on the price charged when that element is sold separately,
          price lists, renewal rates and other methods. The estimated fair value
          of undelivered elements is deferred and recorded as revenue when
          services are performed or products are delivered.

          The majority of VASCO's multiple element arrangements involve the
          selling of tokens, software and PCS. Tokens are sold separately and
          their price is based on standard price lists or based upon specific
          negotiated prices if the quantities being sold are greater than those
          included on the price list. Software can also be sold separately, as
          in the case of a customer purchasing additional user licenses.
          Software fees are established from standard price lists. VASCO
          provides PCS as technical support and software upgrades (on a "when
          and if available" basis) to customers. PCS is optional and can be sold
          separately, such as the renewal of software technical support. Pricing
          for a renewal of a PCS is based on an established percentage of the
          user license fee attributable to the specific software and is applied
          consistently to all PCS arrangements. When discounts are given in a
          multiple element arrangement, a proportionate amount of the discount
          is applied to each element based on each element's fair value without
          regard to the discount.

     10.  We note that you disclose your standard warranty policy on
          authenticators on page F-11. Supplementally tell us if you offer any
          other contingencies such as rights of return, cancellation clauses,
          condition of acceptance, price protection, etc. and the accounting
          treatments for those contingencies. Describe significant assumptions,
          material changes and reasonably likely uncertainties. Also, tell us
          how you considered paragraph 6 of SFAS 48, as applicable.



Mark P. Shuman
June 17, 2005
Page 10


     RESPONSE:

          There are no other material contingencies associated with the sale of
          the Company's products. VASCO does not offer the right to return its
          products except under the standard warranty provision. Given the
          nature of the Company's products, customers generally determine
          whether the functionality of our products meet their needs prior to
          purchasing. Once satisfied, a binding contract or purchase order is
          given to VASCO. There is no need for a right to return the product.
          While paragraph 6 of SFAS 48 is applicable to VASCO, because there is
          no right of return, no accrual is necessary at this time.

          VASCO also does not offer any cancellation clauses nor do we offer
          price protection. Conditions of acceptance are not applicable because
          a potential customer reviews VASCO's product functionality during a
          demo process. This process precedes the actual sale and revenue
          recognition. If during this demo process a potential customer
          determines that VASCO's solution does not meet their specific needs,
          there is no current or future sale.

     11.  We note from your disclosure on page 4 that you sell your products
          through distributors and resellers. Clarify if your revenue
          recognition policies differ when your arrangements are sold through
          resellers. In this regard, clarify whether your recognize revenue when
          sold to your resellers or only when delivered to the end-users. Tell
          us if your resellers have return rights or other rights and
          warranties. Also, advise how much revenue has been recognized from
          sales by resellers in each of the periods presented.

     RESPONSE:

          The Company's revenue recognition, return goods, warranty and all
          other policies are the same for sales to distributors and resellers as
          they are for direct customers. Revenues are recorded when shipment is
          made, title transfers and the performance obligations of the Company
          are completed.

          Distributors and resellers are trained by the Company to help ensure
          that their sales process to their customers can be executed
          effectively. As a result, the Company generally only receives firm
          purchase orders from the distributors/resellers when they have
          completed the demo process with their customers and have received a
          firm purchase order from the final end user. The



Mark P. Shuman
June 17, 2005
Page 11


          distributor/reseller is fully responsible, with no recourse to the
          Company, for the price to charge for sales of the product, setting its
          own policies with regards to return goods and collecting payments for
          any goods sold.

          It should also be noted that once a distributor/reseller has
          identified an opportunity for a large sale, the Company can provide
          assistance during the demo phase to help ensure that the product
          delivered will meet the end customer's needs.

          As a result of the accounting and contractual processes being the same
          for distributors/resellers and direct customers, as well as the
          potential collaboration between the Company and distributors/resellers
          for large sales, we do not segregate sales to distributors/resellers
          from sales to end users made directly by the Company.

     12.  We note your disclosure in MD&A that you offer volume purchase
          discounts to customers. Supplementally explain the terms and
          conditions of your volume purchase discounts and tell us how you
          considered EITF 01-09 in accounting for such offers.

     RESPONSE:

          The volume purchase discounts the Company references in its financial
          statements reflect the result of specific negotiations of contract
          terms for large-volume sales of Tokens. Price lists generally address
          orders of a size that are commonly sold through the
          distribution/reseller channel. When orders exceed those normal
          transactions sizes, the prices for the product are subject to specific
          negotiation. As a result, the terms of each contract for large volumes
          are specifically negotiated. Those contracts are for a specific
          quantity at a specific price and do not include variable pricing
          provisions.

          The price that the Company is willing to accept for these large orders
          is less than what it is willing to accept for smaller orders. To
          explain this concept to investors, the Company has used the term
          "volume purchase discounts." Such discounts are reflected as a
          reduction in sales price as required by EITF 01-09.

NOTE 12:  DISCONTINUED OPERATIONS, PAGE F-20



Mark P. Shuman
June 17, 2005
Page 12


     13.  We note that you refer to an independent valuation to determine the
          fair value of the promissory note and convertible preferred stock
          received from SSI. When you refer to an independent valuation, you
          should disclose the name of expert and include the expert's consent
          with the filing. Refer to Section 436(b) of Regulation C.
          Alternatively, you may remove this reference.

     RESPONSE:

          Given the complexity of its sale of the VACMAN Enterprise line of
          business, the Company engaged an outside third party to assist in the
          determination of the value of consideration received from the sale.
          That valuation did not constitute a fairness opinion and, as a result,
          the contract with the valuation firm prohibits the public disclosure
          of their name. The Company is, however, permitted to disclose the
          valuation firm's name and provide a copy of the report to the SEC if
          so requested in writing. The Company will remove this reference in
          future filings.

     14.  We note that the VASCO's CEO & Chairman of the Board owns 19% of SSI.
          Tell us how you are accounting for the "note receivable and investment
          in SSI." In this regard, tell us if you are using an equity method to
          account for this investment and address how you considered the
          "significant influence" factor of APB 18 and EITF 02-14.

     RESPONSE:

          The accounting policy used relative to the investment in SSI is
          included in the footnotes to the financial statements on Form 10-K,
          page F-10. As a supplement to that footnote, the Company reduces the
          carrying value of the installment note due from SSI as payments are
          received. The Company will also reduce the investment in the preferred
          stock as cash dividends are received from SSI (see basis for valuation
          of the preferred stock in the answer to question number 15 below). As
          noted in the referenced footnote, the Company will reduce the
          investment, whether related to the installment note or in the
          preferred stock, if it becomes apparent that the value of the
          investment has been permanently impaired. The holding of the preferred
          stock may result in a gain in the future, and will be reviewed within
          the context of SFAS No. 115 as appropriate.

          The Company does not believe that it has the ability to exercise
          "significant influence" over the operating and financial policies of
          SSI. At the date of



Mark P. Shuman
June 17, 2005
Page 13


          acquisition, the Company did not participate in SSI's policy-making
          process, did not have any material intercompany transactions with SSI
          nor was there any dependency, financial or otherwise, by SSI on the
          Company. Even though VASCO's CEO and Chairman of the Board may have
          owned 19% of SSI (less than the 20% at which level APB 18 indicates
          that there is a presumption of ability to exercise significant
          influence) as of the date of the sale of the of the VACMAN Enterprise
          line of business, that percentage has consistently declined each
          subsequent reporting period and was 7.7% as of December 31, 2004.
          Further, his ownership is expected to continue to decline
          substantially as SSI continues to execute its business plan. At the
          time of the sale, SSI was a start-up organization and planned to grow
          through acquisitions. Those acquisitions were to be and have been
          funded through the sale of stock to raise capital and the issuance of
          stock as part of the consideration paid for acquisitions. If SSI
          executes the transactions noted in Management's Discussion and
          Analysis included in its most recent filing on Form 10-KSB, Mr. Hunt's
          ownership position will be below 5%.

          A committee that was comprised of independent directors of the
          Company's Board oversaw the sale of the VACMAN Enterprise line of
          business. The Company's CEO was excluded from the process to avoid a
          conflict of interest. As a result, the Company's direct influence
          (i.e., excluding Mr. Hunt's investment and participation on the Board)
          is limited to its contractual rights under the sale agreement. Those
          rights only include the ability to recover assets pledged as security
          in the event of a default under the agreements, preference rights on
          liquidation and the right to vote its shares of preferred stock. The
          voting rights under the preferred stock would be currently equal to
          approximately 10% of SSI and declining as the transactions noted above
          are executed.

     15.  We also note that you recorded the sale of the Company's VACMAN
          enterprise business based on the fair value of the promissory note and
          preferred stock as determined by an independent valuation firm.
          Supplementally explain the assumptions used in determining the fair
          value of SSI's convertible preferred shares to be $600,000. In this
          regard, we note that the preferred stock is convertible into 2.0
          million shares of SSI's common stock, which had a trading price of
          approximately $2.00 per share when the transaction took place. Please
          explain.

     RESPONSE:



Mark P. Shuman
June 17, 2005
Page 14


          At the time of the transaction, the Company did not consider the
          common stock price to be a reasonable indication of the fair value of
          the preferred stock received. Accordingly, the Company used an
          independent valuation firm to estimate the fair value of SSI's
          convertible preferred stock. The valuation firm and the Company took
          into consideration that SSI was a start-up company, there was limited
          trading volume in the common stock and the preferred stock was not
          liquid. The conversion of the preferred stock was limited to 500,000
          shares on the second anniversary date of its issuance, 500,000 shares
          on or after the third anniversary date and the remaining shares not
          previously converted on or after the fourth anniversary date.
          Therefore, the independent valuation firm used a discounted cash flow
          approach to valuing the preferred shares based upon the factors
          mentioned above, industry analysis, dividends to be paid on the
          preferred stock and SSI's financial forecast for a three-year period
          beginning on the acquisition date. This approach was deemed
          appropriate for a start-up company.

          Based on the analyses of the cash flows from the business, it appeared
          that the value per share, if converted to common stock, would be less
          than the currently traded price of the common stock. As a result, it
          was determined that the primary value of the preferred was represented
          by the discounted cash flow of the dividend payments. The dividend
          payments were discounted using a 20% discount rate.

NOTE 18: SUBSEQUENT EVENT - A.O.S. ACQUISITION, PAGE F-23

     16.  We note that you allocated $367,000 of the purchase price in the
          A.O.S. acquisition to customer purchase commitments and $6 million to
          goodwill. Supplementally explain how you determined that there were no
          other intangibles such as customer relationships acquired in this
          transaction and tell us how you considered EITF 02-17 in your
          analysis.

     RESPONSE:

          A little background on A.O.S. may be helpful in putting the following
          comments into perspective. A.O.S. was formed in late 2002 through the
          merger of two firms that had strength in the engineering discipline.
          The majority of the work performed by A.O.S. and its predecessor
          companies was contract engineering. As a result, A.O.S. did not own
          the intellectual property they developed under



Mark P. Shuman
June 17, 2005
Page 15


          contract with others and did not have a product line that would
          generate significant recurring revenue from its customer base. The
          primary asset acquired, as viewed by the Company, was the value of its
          assembled workforce (i.e., the engineering talent needed to expand the
          Company's smart-card reader product line and respond to its existing
          customers' requests for engineering changes on a timely basis).

          While it should be noted that the Company did indicate in its filings
          that the allocation of the purchase price was preliminary, the Company
          does believe that there will be no other material assets identified.
          The Company reviewed each of the components identified in EITF 02-17
          and SFAS No. 141 for applicability to the A.O.S. transaction and its
          preliminary conclusions are as follows:

          a.   Customer Lists: No value was assigned to customer lists as:

               o    The Company has no intent or past practice of marketing,
                    leasing, selling or renting its customer lists.

               o    Since most of A.O.S.'s customers were banks and other
                    well-known financial institutions, the customer list would
                    have little or no standalone value.

               o    Given the size of A.O.S., its date of formation, and the
                    nature of its business, the number of customers served was
                    small.

          b.   Order Backlog: Value was assigned to the order backlog as noted
               in the question above.

          c.   Customer relationships: A.O.S. did establish relationships with
               its customers through contracts in the form of firm purchase
               orders, which were included in the order backlog above. The value
               of the relationship beyond the contract was not deemed to be
               significant for the following reasons:

               o    Products produced by A.O.S. are used with specific computer
                    applications within its employee and /or customer base.
                    Those applications have a defined number of users and the
                    amount of future orders and the value of such orders is
                    undeterminable as it is dependent on a number of factors
                    that are not available to the Company (e.g., percentage of
                    existing customer's existing clients using the application
                    that already have devices, the customer's plan to provide
                    the devices to others using the application



Mark P. Shuman
June 17, 2005
Page 16


                    that were not part of the original distribution, the
                    customer's plans to extend or roll out the product to other
                    applications, the customer's plans to introduce/change the
                    application's technology that would affect the current
                    install base, which may increase the need for new product or
                    replace existing product with a competitive technology).

               o    One customer had been responsible for the majority of the
                    A.O.S.'s revenue in each of the prior two years. That
                    customer, however, has a history of using multiple vendors
                    and had indicated to A.O.S. that they had requested a
                    proposal for comparable product from a competitor. In
                    addition to the competitor from which a proposal was
                    requested, there are a number of other competitors (e.g.,
                    RSA Securities, ActivCard, SCM Microsystems, Xiring) that
                    may compete for the customer's future business.

          In addition to the items identified in EITF 02-17, the Company
          carefully reviewed, along with counsel, the intellectual property that
          was included in the transaction and concluded that there were no
          significant intangible assets included in the transaction. The Company
          also reviewed other contracts it was acquiring with the business
          (primarily an operating lease and a third-party manufacturing
          contract) and concluded that none of the contracts were materially
          different from current market prices.

                                      * * *

          We would be pleased to discuss the foregoing responses with the Staff
if that would be helpful in its review. Please feel free to contact the
undersigned at 202-220-1454 in this regard.

                                         Very truly yours,


                                         Robert B. Murphy

Cc: Mr. Clifford Bown
    VASCO Data Security International, Inc.