Related Key Cryptanalysis of WAY Biham DES CAST DES X NewDES RC and TEA

We present new related key attacks on the block ciphers WAY Biham DES CAST DES X NewDES RC and TEA Di er ential related key attacks allow both keys and plaintexts to be chosen with speci c di erences KSW Our attacks build on the original work showing how to adapt the general attack to deal with the di culties of the individual algorithms We also give speci c design principles to protect against these attacks