Digital Signatures

• This is an “Encrypted Hash”

• Provides data Authenticity, data Integrity and Non-Repudiation

• First the data to be signed is hashed then the hash is “encrypted” with the signer's private key.

• Verification is done by anyone by first hashing the data then comparing with the “decrypted” hash from the signer.

• See http://en.wikipedia.org/wiki/Digital_signature