Abstract: “With the widespread use of computers and Internet as well as electronic commerce, computer security becomes more and more important. In this paper, we introduce AES with key dependent S-box, rotor dependent subkeys and frequency analysis resistance (AES-KSF). The AES-KSF algorithm is compared with AES and gives excellent results from the viewpoint of the security characteristics and the statistics of the ciphertext. Also, we apply the randomness test to the AES-KSF algorithm and the results shown that the new design passes all tests which proven its security.”

Keywords: Advanced Encryption Algorithm (AES), key dependent S-box, rotor, frequency analysis, inverse power function.