Secure, swift cryptographic key exchange

Details Secure, swift cryptographic key exchange Secure, swift cryptographic key exchange

1995-06-01

1996-12-10

Cain, David C.

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

380 28, H04L 900

Patent

active

055839398

ABSTRACT:
Using the present cryptographic key exchange protocol, a first of two cryptographic units selects quantities "A" and "B." That same unit then applies a mathematical function ".PHI..sub.1 " to A and B to compute a third quantity "C.". A and B and the function .PHI..sub.1 posses the property that knowing A or B, and C, and the function .PHI..sub.1, it is mathematically impossible to compute the unknown quantity B or A. The first unit then transmits A together C to the second unit while retaining B. The second unit selects a fourth quantity "D" and then applies a second mathematical function .PHI..sub.2 to A and D to compute a quantity "E" which the second unit transmits to the first unit while retaining D. The quantities A and D and the function .PHI..sub.2 must posses the property that knowing D and E, and the function .PHI..sub.2, it is mathematically impossible to compute the unknown quantity D. Then the second unit applies a third mathematical function ".PSI..sub.2 " to D and C to compute the secure key "K." The first unit upon receiving the quantity E then applies a fourth mathematical function .PSI..sub.1 to B and E to also compute the secure key K.

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Schneier, Bruce, "Applied Cryptography, Protocols, Algorithms, and Source Code in C," Copyright 1994 John Wiley & Sons, Inc.

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