January 22, 2002
Practical Aspects of Modern Cryptography
40
Triple-DES (3DES)
nTriple-DES
is DES run three times
nSometimes
called 3DES-EDE because it has three stages:
encryption-decryption-encryption
DES
Encryption
DES
Decryption
DES
Encryption
Ciphertext
Plaintext
Key K1
Key K2
Key K3