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System for automatic decryption of file data on a per-use basis and automatic re-encryption within context of multi-threaded operating system under which applications run in real-time

  • US 5,796,825 A
  • Filed: 10/06/1997
  • Issued: 08/18/1998
  • Est. Priority Date: 01/16/1996
  • Status: Expired due to Term
First Claim
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1. A machine system for maintaining confidential information generally in encrypted form while allowing for decryption of such confidential information into temporary plaintext form, said machine system comprising:

  • (a) a memory storing a plurality of digital data files, wherein each of said files is organized as belonging to one of at least first and second directories or subdirectories, and further wherein at least a first file among said files belongs to a corresponding one of said directories or subdirectories, and said first file contains first data representing a pre-encrypted form of confidential first information;

    (b) a decrypting mechanism for decrypting ciphertext data into plaintext data;

    (c) recryption control means for selecting one of the files stored in said memory and for causing the decrypting mechanism to decrypt data contained in the selected file and for automatically later eliminating the decrypted data,(c.1) wherein said recryption control means is responsive to a supplied directory exclusion list, the directory exclusion list identifying one or more directories or subdirectories whose files are to be excluded from being selected by the recryption control means for decryption, and wherein the recryption control means accordingly does not select files identified by the directory exclusion list for decryption by the decrypting mechanism.

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