Data Protection and Security

I

Introduction To Cryptography

I.II

Types of Cryptanalysis

Key Space refers to the set of all possible values the key might have. The size of key space is critical because if it is not large enough, using a plaintext-ciphertext pair, the attacker can exhaustively try all the key space until he finds the correct key. Exhaustive key search is sometimes referred as the brute-force attack since there is no intelligence involved. The goal of the cryptanalyst is to come up with a more efficient attack than the brute-force attack.