Basic HTML version of Foils prepared May 30 99

Foil 9 Secret Key Authentication

From Basic Mathematics of Security Systems CPS714 Computational Science Information Track -- June 2 99. by Geoffrey C. Fox
1 Each individual A and B picks a random number rA and rB which are only known to themselves and a fresh for session to be authenticated. There is shared key KAB which is not to be transmitted but A needs to know that B knows KAB and B needs to know that A knows KAB. The random numbers are known as challenges.
2 rA
3 Decrypt xA and see it gives rA
4 Encrypt rA to give xA
5 xA
6 rB
7 Encrypt rB to give xB
8 xB
9 Decrypt xB and see it gives rB
in Table To:

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