Extensions to DESthat may give a longer effective key
Tripe-DES: ciphertext =
EncDESk1(EncDESk2(EncDESk3( plaintext)))
EncDESk1(DecDESk1 xor k2(EncDESk2( plaintext)))
DESX: ciphertext = k1 xor EncDESk1(message xor k3)
Previous slide
Next slide
Back to first slide
View graphic version