Entity Authentication•Problem:Alice wants to prove to Bob that she is Alice and/or vice versa.•Basic idea: Alice shows that she knows some secrecywhich is presumably known only to Alice(and Bob).•That secrecy could be, for example:- Alice’s password or PIN- a MAC or encryption key shared by Alice and Bob, or - Alice’s RSA private key.
:0. AliceBob: "I'm Alice"1. AliceBob: "What's your password?"2. AliceBob: Alice's password3. Bob verifies the passwProtocordolIs it secure against an eavesdropper?→←→
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