1. Fix the first plain text X and the corresponding ciphertext Y .
2. Assume the second plain text X1 and the correspondingcipher text Y 1.
3. Obtain K1 from (8).
4. Use the found value in (11). If it does not hold, return to step 2.
5. Obtain K2 from (9).
6. Use the found value in (10). If it does not hold, return to step 2.
7. Since both (11) and (10) hold, the slide pair and the secret key are found.