Question

describe the simple protocol for classical cryptographic key exchange. assume alice and bob want to communicate...

describe the simple protocol for classical cryptographic key exchange. assume alice and bob want to communicate and cathy is the trusted third party

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Answer #1

Simple protocol for Classical Cryptographic key exchange

Goal

Alice and bob want to communicate

Criteria

Cathy is the trusted third party

Classical Cryptographic key exchange

How do Alice and Bob begin?

  • Alice can’t send it to bob

Consider trusted third party, Cathy

  • Alice and cathy share secret key KA
  • Bob and Cathy share secret key KB

Use this to exchange shared key KS

Simple Key Exchange Protocol

3 kACathy {request for session key to Bob > ka Alice Cathy Alice Bob Alice {m}応 Bob Alice -<

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