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Security file system and method for securing data in a portable data carrier

  • US 4,882,474 A
  • Filed: 02/05/1988
  • Issued: 11/21/1989
  • Est. Priority Date: 05/16/1986
  • Status: Expired due to Term
First Claim
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1. In a portable data carrier, a security file system containing both a file header region and a file data segment region, the file header region including a unique access code for verifying the identity of an individual attempting to access the data in the portable data carrier, and the file data segment region including a plurality of files for storing alterable data, each of the plurality of files having alterable data associated therewith for storage in any of multiple locations throughout the file data segment region, the portable data carrier comprising:

  • access means for inputting an externally provided code for accessing the data in the portable data carrier,counting means responsive to the access means for recording all access attempts, the counting means advancing a count each time the externally provided code is inputted to the portable data carrier,comparison means for comparing the unique access code with the externally provided code;

    verifying means for providing an indication when the externally provided code compares favorably with the unique access code stored in the portable data carrier;

    counting reset means for resetting the count advanced by the counting means to its previous count, the counting reset means being activated in response to the verifying means indicating a favorable comparison and data access is permitted, the counting reset means remaining inactive in the absence of the verifying means indicating a favorable comparison.

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