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A digital signature needs a

  • A.Private-key system
  • B.Shared-key system
  • C.Public-key system
  • D.All of them

Answer: C

Correct answer: Public-key system

A digital signature must be creatable by one party alone and verifiable by everyone, which only asymmetric cryptography allows: the sender signs with a private key and anyone can check the signature with the matching public key. A shared key would let either party forge the other's signature.

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