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Actually, contrary to what kelalaka says, the length (and existence) of the IV depends on the exact mode of operation; some modes of operation take an IV whose length differs from the block size, and there are modes of operation (other than ECB) which don't take an IV at all. Now, with DES, by far the most common mode of operation is CBC, which does take a ...


3

The IV is part of the block cipher mode of operation, not of the block cipher itself. The block cipher simply doesn't have any input for an IV, it just takes an input block and produces an output block using a key. So you cannot implement an IV for DES itself. The block size is however usually of influence to the mode of operation. Even then, the IV may ...


3

DES is an (8-byte) 64-block cipher with 56-bit active key and 8-bit parity bit (which makes total 64), and the parity bits generally discarded, i.e. not checked. When using a block cipher mode of operation you need an IV (or Nonce), except the insecure ECB mode. The IV size is determined by the mode of operation and in archaic modes (CBC, CTR, OFC, CFB) it ...


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