Assignment 2
Network Security
Karl-Johan Grahn
Roll no 03005202

3)

1. The error propagates: An error in the transmitted C1 corrupts P1 and P2, because C1 is not only decrypted to get P1 but is also XORed with the output of decrypting C2. No blocks beyond P2 are affected.

2. If there is an error in P1, this error is propagating through every ciphertext block. The corresponding bits of the received value is changed.