The Triple-DES encryption algorithm in ECB mode (Menu Crypt/Decrypt \ Symmetric (modern))

In the version of Triple-DES that is used here, a threefold encryption operation is performed with two different DES keys:

The plaintext block is DES-encrypted with the first key.

The resulting block is DES-decrypted with the second key.

The resulting block is now DES-encrypted once more with the first key.

Decryption entails alternating between encryption and decryption in the reverse sequence. This method is also known as Encrypt-Decrypt-Encrypt (EDE).

As in DES, CrypTool offers both ECB mode and CBC mode.

The key is entered in the Key entry dialog.

CrypTool contains a tool which performs a Brute-force attack on the Triple-DES encryption algorithm in ECB mode.

In the Examples chapter there is one example which covers both encryption and decryption using the Triple-DES encryption algorithm in CBC mode and also the Brute-force attack. This example can also be used for the Triple-DES encryption algorithm in ECB mode; the encrypted documents are of course different.