Basic HTML version of Foils prepared August 4 1997

Foil 41 Secret Key Authentication

From Remarks on Java and Internet Security Web Certificate CPS616 Enhancement -- Summer 1997 . by Geoffrey C. Fox
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.
rA
Decrypt xA and see it gives rA
Encrypt rA to give xA
xA
rB
Encrypt rB to give xB
xB
Decrypt xB and see it gives rB

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