Cryptography – Particular algorithmic function encoding – Nbs/des algorithm
Patent
1995-02-21
1996-09-17
Cangialosi, Salvatore
Cryptography
Particular algorithmic function encoding
Nbs/des algorithm
380 25, 380 30, H04L 908, H04L 930
Patent
active
055577652
ABSTRACT:
A system and method for dam escrow cryptography are described. An encrypting user encrypts a message using a secret storage key (KS) and attaches a data recovery field (DRF), including an access rule index (ARI) and KS, to the encrypted message. The DRF and the encrypted message are stored in a storage device. To recover KS, a decrypting user extracts and sends the DRF to a data recovery center (DRC) that issues a challenge based on access rules (ARs) originally defined by the encrypting user. If the decrypting user meets the challenge, the DRC sends KS in a message to the decrypting user. Generally, KS need not be an encryption key but could represent any piece of confidential information that can fit inside the DRF. In all cases, the DRC limits access to decrypting users who can meet the challenge defined in either the ARs defined by the encrypting user or the ARs defined for override access.
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Balenson David M.
Ellison Carl M.
Lipner Steven B.
Walker Stephen T.
Cangialosi Salvatore
Trusted Information Systems, Inc.
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