k - Applied Cryptography Group

Online   Cryptography   Course                                                                             Dan   Boneh  

Block  ciphers   What  is  a  block  cipher?  

Dan  Boneh  

Block  ciphers:    crypto  work  horse   n bits PT Block

n bits CT Block

E, D Key

k bits

Canonical examples: 1.  3DES: n= 64 bits, 2.  AES:

k = 168 bits

n=128 bits, k = 128, 192, 256 bits Dan  Boneh  

Block  Ciphers  Built  by  Itera