Improvement of Chaotic Image Encryption Method Based on LDPC Code

Chaotic image encryption algorithm based on Low-Density Parity-Check (LDPC) code algorithm has the problem of high complexity and poor real-time performance. We choose the quasi-cyclic Low-Density Parity-Check (QC-LDPC) code instead of the Gallagher code in the algorithm and achieve better results than the previous one, especially in high-intensity noise. The watermark obtained by this method has high attack resistance and more resource saving in hardware. The QC-LDPC used in this paper is a code word constructed by the Fibonacci sequence, which has the advantages of small storage space, high flexibility, and high performance. Its excellent performance is also proved by its application in digital watermarking technology, which provides a reference for applying LDPC codes in more directions. Meanwhile, the practical applicability of LDPC digital image watermarking is further improved.