Differential evolution for the cryptanalysis of transposition cipher

Transposition cipher is a class of hystorical encryption algorithms that rearrange positions in plaintext based on some fixed permutation which is its secret key. In this research Differential Evolution was used to attack the transposition cipher, which is a permutation of integer problem. Despite the fact that Differential Evolution mostly used for problem with real numbers; this paper shows that Differential Evolution could be used to correctly decrypt ciphertext that has up to permutation length of 9, but started to have half of incorrect answers in 10 simulations done to permutation length of 10.