1. Given a 64 bit plaintext FFFE 397D AC28 8855 and 48 bit Round key 4D77 32C5 29EF, perform one round DES encryption and decrypt the computed cipher retrieving the original input.
2. Given a 56-bit key 88DF E9DC C277 CA, compute 48 bit Round1, Round2 and Round3 keys.
