Method and apparatus for calculating message signatures in advan

Details Method and apparatus for calculating message signatures in advan Method and apparatus for calculating message signatures in advan

1995-06-30

1997-05-27

Cangialosi, Salvatore

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

380 30, H04L 930

Patent

active

056339313

ABSTRACT:
The present invention provides an improved method and apparatus for authenticating message packets to prevent forgery thereof. A server processes a client request and generates a response message. A message signature, which is generated using the session key and the message itself, is appended to the message to create an appended message. The server sends the appended message to the client. At the same time that the server works on the client request, the client predicts the response message and calculates a predicted message signature based on the session key and the predicted message. After receiving the appended message, the client strips the message signature from the appended message and compares it to the predicted message signature. If the two signatures match, the received message packet is authenticated.

REFERENCES:
patent: 4393269 (1983-07-01), Konheim et al.
patent: 4881264 (1989-11-01), Merkle
patent: 4947430 (1990-08-01), Chaum
patent: 5231668 (1993-07-01), Kravitz
patent: 5349642 (1994-09-01), Kingdon
patent: 5371794 (1994-12-01), Diffie et al.
patent: 5442645 (1995-08-01), Ugon et al.
patent: 5475763 (1995-12-01), Kaufman et al.
RFC 1320, "The MD4 Message-Digest Algorithm", R. Rivest, MIT Laboratory for Computer Science and RSA Data Security, Inc., Apr., 1992.

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