Arithmetic of Rijndael and Its Frequency Analysis

This paper gives a detailed analysis of the processing procedure and the mathematical rationale of Rijndael arithmetic, the final AES selected arithmetic. After the χ 2-check of the cipher frequency on the levelof α=0.005, the paper asserts that the cipher bit-stream follows the binomial distribution B(n, 0.05). So the bits of the Rijndael cipher have a pretty random property.