[Cryptography] Secret Handshake problem.
James A. Donald
jamesd at echeque.com
Sat Mar 4 20:00:46 EST 2017
A is an identity that is a member of a club.
C and D are identities that are not members of this club.
C wants to reveal to D that C and A are the same, that C is secretly a
member of the club, if and only if D is secretly a member of the club
under a different identity.
I seem to recollect that this is a solved problem, but do not remember
the solution.
Also known as the "Are you also a Soviet Spy?" problem.
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