DES-ECB

[Davidi74]

In DES the least significant bit of each key byte is used as parity bit and does not affect the en-/decryption process.
0xcc in binary is 11001100 while 0xcd is 11001101. Only the last bit (least significant bit) is different and therefore both produce the same result.

Edit: DES keys are still being provided with 64 bits but 8 of them are ignored making the effective key size 56 bits.

Thanks so much.

Is that why we need a special character set for DES, because with only 7 bits, it cant make the full 00-FF?