January 22, 2002
Practical Aspects of Modern Cryptography
41
Triple-DES (3DES)
nTriple-DES
can be run in either two-key or three-key modes
nIn
two-key mode, K1 = K3
nIn
three-key mode, K1, K2, K3 are all distinct
nIf
K1 = K2 = K3, you have just DES
DES
Encryption
DES
Decryption
DES
Encryption
Ciphertext
Plaintext
Key K1
Key K2
Key K3