Message Authentication Code (MAC)

A cryptographic checksum ensuring data integrity and authenticity.

Understanding:

A Message Authentication Code (MAC) is a cryptographic mechanism used to verify the integrity and authenticity of a message. It prevents data tampering and unauthorized modifications during transmission.

Common Applications and Use Cases:

Used in secure communication protocols like TLS and IPSec.
Protects financial transactions in online banking and payment systems.
Ensures integrity in software updates and digital signatures.

Best Practices and Security Considerations:

Use strong cryptographic algorithms like HMAC-SHA256.
Implement MAC-based authentication in APIs and secure file transfers.
Protect cryptographic keys with hardware security modules (HSMs).