Optimized enveloping via key reuse

Details Optimized enveloping via key reuse Optimized enveloping via key reuse

2006-04-18

2006-04-18

Sheikh, Ayaz (Department: 2136)

Cryptography

Particular algorithmic function encoding

Public key

C380S285000, C380S282000

Reexamination Certificate

active

07031469

ABSTRACT:
The present invention provides optimized enveloping for a public key cryptography system. A sender may reuse a secret key in multiple communications to a recipient without the need to recompute or re-encrypt the secret key. The first time a message is sent to a recipient, the sender generates and encrypts a secret key, then stores the secret key, the encrypted secret key, and associated counter data in a local data store. For subsequent messages to the recipient, the sender determines from the counter data whether the secret key may be reused; if the secret key is reused, the sender updates the counter data. A recipient stores previously received secret keys in a local data store in both encrypted and decrypted form. If an encrypted secret key in a received message matches an entry in the local data store, the recipient uses the previously decrypted secret key to decrypt the message.

REFERENCES:
patent: 5857020 (1999-01-01), Peterson, Jr.
patent: 5907621 (1999-05-01), Bachman et al.
patent: 6061452 (2000-05-01), Suzuki
patent: 6195433 (2001-02-01), Vanstone et al.

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