Digital Signature Schemes

The Function of signatures is to prove authenticity and non-repudiation (the signer cannot deny the action).

One way is to use the same protocol as Asymmetric-Key Encryption, but instead the:

• Private key used to sign messages
• Public key used to verify signature

Some examples are:

• RSA
• DSA
• ECDSA (over elliptic curves)

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Relevant Note(s): Signatures VS MACs