●●●●● ●●●● ●●0 Basic Terminology ●●● ●●●● plaintext -the original intelligible message ciphertext- the coded message that depends on the plaintext and the secret key cipher-algorithm for transforming plaintext to ciphertext key -info used in cipher, known only to sender/recipient encipher(encrypt)-converting plaintext to ciphertext decipher (decry pt)-recovering ciphertext from plaintext cryptography -study of encryption principles/methods cry ptanalysis( codebreaking)-the study of principles/methods of deciphering ciphertext without knowing key cryptology-the field of both cryptography and cryptanalysis COMP4690. HKBUCOMP4690, HKBU 3 Basic Terminology ⚫ plaintext - the original intelligible message ⚫ ciphertext - the coded message that depends on the plaintext and the secret key ⚫ cipher - algorithm for transforming plaintext to ciphertext ⚫ key - info used in cipher, known only to sender/recipient ⚫ encipher (encrypt) - converting plaintext to ciphertext ⚫ decipher (decrypt) - recovering ciphertext from plaintext ⚫ cryptography - study of encryption principles/methods ⚫ cryptanalysis (codebreaking) - the study of principles/ methods of deciphering ciphertext without knowing key ⚫ cryptology - the field of both cryptography and cryptanalysis