Basic HTML version of Foils prepared May 30 99

Foil 13 Authentication with public key Cryptography

From Basic Mathematics of Security Systems CPS714 Computational Science Information Track -- June 2 99. by Geoffrey C. Fox
Here A chooses a challenge -- a random number r and can verify that B is at other end using solely public information!
A Sends x
Decrypt x with dB and send back challenge
A Encrypts r using eB to give x
Send r
Only B could have sent back r
Alice is A
Bob is B
eB is public key of B
dB is B's private key

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