Cryptography – Particular algorithmic function encoding – Nbs/des algorithm
Patent
1996-10-15
1998-09-15
Tarcza, Thomas H.
Cryptography
Particular algorithmic function encoding
Nbs/des algorithm
380 25, 380 44, 380 49, H04L 900
Patent
active
058091408
ABSTRACT:
Methods and apparatus are disclosed for providing secure session key distribution using a smart circuit card or other intelligent device. First and second hosts communicate with each other and with a server over a communication network. The first host initiates the session key distribution process by transmitting a session identifier to the server. The first host uses a first smart card storing the first host secret key to generate a first message in the form of a random bit stream which is transmitted to the second host. The server generates a second message as a function of the server secret key and the session identifier, and transmits it to the first host. The second host uses a second smart card storing the second host secret key to generate a third message as a function of the second host secret key and the first message, and transmits the third message to the first host. The first host then uses the first smart card to generate a potential session key pair as a function of the second and third messages and the first host secret key. If the first host accepts the session key pair, it transmits one of the session keys of the pair to the second host. The second host uses the second smart card to generate a validity indication as a function of the transmitted session key and a portion of the third message, and accepts or rejects the session key depending upon the result. The first and second cards may be implemented as stateless devices which include only limited memory, processing and input/output capabilities.
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M. Bellare, P. Rogaway, "Provably Secure Session Key Distribution--The Three Party Case," 27th Annual ACM Symposium on Theory of Computing, pp. 57-66, 1995.
Rubin Aviel D.
Shoup Victor J.
Bell Communications Research Inc.
Giordano Joseph
Hey David A.
Tarcza Thomas H.
White Carmen D.
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