Final answer:
A digital signature is a cryptographic mechanism used to authenticate a data unit's source and integrity, protecting against forgery, and it is the correct answer to the given question.The correct option is: B) Digital signature
Step-by-step explanation:
Data appended to, or a cryptographic transformation of, a data unit that allows a recipient of the data unit to prove the source and integrity of the data unit and protect against forgery is known as a digital signature. A digital signature is an electronic form of a signature that can be used to authenticate the identity of the sender of a message or the signer of a document, and to ensure that the original content of the message or document has not been altered. Essentially, a digital signature is a mathematical scheme for demonstrating the authenticity of digital messages or documents.
Security audit trails, on the other hand, track user actions for detecting security breaches or incidents. Encipherment refers to the conversion of data into a coded form to prevent unauthorized access. An authentication exchange is a process by which one entity proves the identity of another entity, typically through the use of cryptographic methods.The correct option is: B) Digital signature