Text Encryption Scheme Based on Chaotic Map and DNA Strand Displacement

A text encryption scheme is proposed by combining chaotic map, DNA encoding and DNA strand displacement (DSD). The scheme firstly scrambles the plaintext information and the sequence generated by the two-dimensional logistic chaotic map through Arnold map, and then performs XOR operation with the sequence generated by the one-dimensional logistic chaotic map, and then converts it into a DNA sequence matrix. Secondly, two encryption rules based on DNA strand displacement are proposed according to the diversity of DNA strand displacement, and the new DNA sequence is obtained by randomly selecting these two encryption rules to perform DNA strand displacement reaction on the DNA sequence. Finally, the new DNA sequence is decoded to obtain the encrypted cipher-text. The example analysis demonstrates that the encryption scheme provides effective encryption and security.