A digital signature is a cryptographic technique that uses the sender's private key to generate a unique code for a message or document. The receiver can use the sender's public key to verify the authenticity and integrity of the message or document. A digital signature can prevent unauthorized change, as any modification to the message or document will invalidate the signature and alert the receiver of tampering. References What is a digital signature? Digital Signature - an overview | ScienceDirect Topics ISACA CISA Review Manual, 27th Edition, page 253