Which cryptographic protocol allows two parties to establish a shared secret key over an insecure communication channel without prior transmission of the secret?
Answer and explanation
Correct answer: C. Diffie-Hellman key exchange
- Step 1: Diffie-Hellman relies on the computational difficulty of the discrete logarithm problem.
- Step 2: Parties exchange public values and and independently compute the shared secret .
Answer
Diffie-Hellman key exchange.
Why not the others: 'AES' is a symmetric cipher requiring an existing shared key; 'SHA-256' is a one-way hashing algorithm; 'RSA signature' provides non-repudiation and authentication, not key negotiation.
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