Plaintext

• original message

• coded message

• algorithm for transforming plaintext to ciphertext

• info used in cipher known only to sender/receiver

ciphertext

• •field of both cryptography and cryptanalysis

• •study of encryption principles/methods

• •converting plaintext to ciphertext

• •coded message

cipher

• •study of principles/methods of deciphering ciphertext without knowing key

• •converting plaintext to ciphertext

• •coded message

• algorithm for transforming plaintext to ciphertext

key

• algorithm for transforming plaintext to ciphertext

• info used in cipher known only to sender/receiver

• •recovering ciphertext from plaintext

• •converting plaintext to ciphertext

encipher

• converting plaintext to ciphertext

• coded message

• •study of principles/methods of deciphering ciphertext without knowing key

• study of encryption principles/methods

decipher

• original message

• algorithm for transforming plaintext to ciphertext

• recovering plaintext from ciphertext

• •field of both cryptography and cryptanalysis

cryptography

• •study of principles/methods of deciphering ciphertext without knowing key

• •study of encryption principles/methods

• •field of both cryptography and cryptanalysis

• •coded message

cryptanalysis

• field of both cryptography and cryptanalysis

• study of encryption principles/methods

• •study of principles/methods of deciphering ciphertext without knowing key

• converting plaintext to ciphertext

cryptology

• coded message

• original message

• recovering ciphertext from plaintext

• field of both cryptography and cryptanalysis

Confidentiality

• Ensure message remains secret during transmission between parties

• Ensure message is not altered while in transit between communicating partners

• Verifies sender is who she says she is

• Proves that nobody but on sender could have sent a particular message