block cipher

noun 0.731

cipher

noun 0.662

ciphering

noun 0.635

data stream

noun 0.548

cryptosystem

noun 0.544

substitution cipher

noun 0.540

cryptographer

noun 0.539

ciphertext

noun 0.534

encryption

noun 0.524

crypt

noun 0.524

cryptography

noun 0.521

side-channel

noun 0.517

cryptogram

noun 0.515

cryptate

noun 0.510

crypto

noun 0.510

cryptanalyst

noun 0.503

bitstream

noun 0.501