**Double DES**

**Double DES Encryption**

Double
DES performs the same operations as DES only difference is that double DES use
two keys K1 & K2.

First it performs encryption on plain text P, which is encrypted using K1 and obtains first cipher text C1.

Again,
cipher text C1 is encrypted by using another key K2 & generate final cipher
text C2.

Figure : Double DES Encryption |

**Double DES Decryption**

Decryption
of double DES is reverse of encryption.

First it
performs decryption on cipher text C2, which is decrypted using K2 and obtains
cipher text C1.

Again,
cipher text C1 is decrypted by using another key K1 & generate original
plain text P.

Figure : Double DES Decryption |

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