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Explain the variants of digital signatures.

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By Dipali Umre

Timestamped Signature:

  • Purpose: To prevent replay attacks.
  • Replay Attack: Someone trying to reuse a signed document maliciously.
  • How it works: Includes a timestamp to ensure the signature’s freshness.

Blind Signature:

  • Purpose: To get a signature without revealing the message content.
  • Use Case: When the sender and signer are different parties.
  • Example Schemes: RSA and DSS (Digital Signature Standard).

Undeniable Digital Signature:

  • Nature: Non self-authenticating.
  • Key Components:
    • Signing Algorithm: Allows the signer to sign a message.
    • Verification Protocol: Limits who can verify the signature.
    • Disavowal Protocol: Prevents the signer from proving a signature is invalid without cooperation.
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