A sequence of decimal numbers generated the chaotic piecewise linear map is used to define a bijection map;two sequences of decimal numbers individually generated by two chaotic piecewise linear maps are used to determine the noise vectors by comparing the element of the two sequences;three operations(bit-by-bit exclusive OR

module multiplication

module addition)in the group and the permutation determined by the bijection map are alternately applied on plaintext with block length 64n bits to produce ciphertext blocks of the same length.Lastly

the performances were analyzed from the theory and experiments.