Cryptography – Key management – Having particular key generator
Patent
1996-12-11
2000-02-01
Swann, Tod R.
Cryptography
Key management
Having particular key generator
380 21, H04L 900
Patent
active
060212039
ABSTRACT:
A protocol is provided for transmitting low security messages and high security messages with one-time-pad cryptosystem. In one implementation of the present invention, low security messages are encrypted using random bit strings in accordance with a one-time-pad encryption scheme. A high security message and a decoy message are embedded within a set of encryption keys and cyphertexts that is to be transmitted from a sender to a receiver. The encryption keys are transmitted over a secure channel from the sender to the receiver, and the cyphertexts are transmitted over a publicly accessible channel from the sender to the receiver. The receiver uses the encryption keys and knowledge regarding keys for a high security message and a decoy message to decrypt the low security messages, extract the high security message and/or decoy message, and decrypt the high security message and/or decoy message. The provision of the decoy message is revealed when duress is applied to coerce the receiver into revealing the key for a supposedly high security message.
REFERENCES:
patent: 4405829 (1983-09-01), Rivest et al.
patent: 5319735 (1994-06-01), Preuss et al.
patent: 5659726 (1997-08-01), Sandford et al.
Schneier, Bruce, "Applied Cryptography" 1994, pp. 13-16 and 66-68.
Bruce Schneier, Applied Cryptography 2nd edition, and 227-28, Oct. 1995.
Calligaro Michael P.
Douceur John R.
Thomlinson Matthew W.
Coddington Trevor Quick
Microsoft Corporation
Swann Tod R.
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