Kerckohffs

Question 1

State kerckhoff’s principle

Answer 1

States that the security of a cryptographic system should depend only on the secrecy of the key not on the secrecy of the algorithm.

Question 2

Describe a known plaintext attack

Answer 2

The attacker has access to both plaintext messages and their corresponding cipher texts.

Question 3

Describe a side channel attack

Answer 3

A side channel attack exploits physical or implementational based information rather than weaknesses in the algorithm itself.