Cryptography20765 marksMessage Authentication Codes
Write down any two limitations of MAC. What do policy and mechanism mean in cryptography? Describe with a scenario.
Write down any two limitations of MAC. What do policy and mechanism mean in cryptography? Describe with a scenario. [5]
--- 1. No Non-repudiation: Since both the sender and receiver share the same secret key (symmetric key) to generate and verify the MAC, either party can forge a message. The sender can later deny sending a message, and there is no way to prove otherwise. A third party cannot distinguish who creat...