Cryptography – Cryptanalysis
Patent
1996-01-16
1997-12-16
Cangialosi, Salvatore
Cryptography
Cryptanalysis
380 25, 380 49, H04L 900
Patent
active
056994281
ABSTRACT:
A machine system for automatic decryption of confidential file data on a per-use basis and automatic later elimination of the decrypted data by scorching and/or re-encrypting is disclosed. The system can operate within a multi-threaded environment. The following features are provided for secure and automatic recryption: (1) use of file-exclusion lists; (2) use of application-program exclusion lists; (3) decrypting as needed in response to intercepted file-OPEN requests; (4) encrypting as needed in response to intercepted file-CLOSE requests; (5) delaying post-CLOSE encryption in special cases; (6) delaying retry of failed encryption; (7) keeping track of the number of application programs that are using each piece of decrypted plaintext; (8) identifying non-confidential files according to the directories they are contained within; (9) including encryption and decryption rules within directories that contain confidential files; and (10) avoiding unnecessary encryption of non-modified plaintext.
REFERENCES:
patent: 5394469 (1995-02-01), Nagel et al.
patent: 5584022 (1996-12-01), Kikuchi et al.
patent: 5606610 (1997-02-01), Johansson
Grawrock David
Lohstroh Shawn
McDonnal William D.
Cangialosi Salvatore
Symantec Corporation
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