 Message authentication

Message authentication is a process used to verify the integrity and authenticity of a message. It ensures that a message has not been altered in transit and confirms the identity of the sender. This is crucial in various communication systems to prevent unauthorized access, tampering, and impersonation. Key concepts in message authentication include: 1. **Integrity**: Ensuring the message has not been modified during transmission. If any part of the message is altered, the integrity check will fail.