Image Encryption Algorithm Based on Block Scrambling and Finite State Machine

• Published in: IEEE access Vol. 8; pp. 225831 - 225844
• Main Authors: Geng, Shengtao, Wu, Tao, Wang, Shida, Zhang, Xuncai, Wang, Yanfeng
• Format: Journal Article
• Language: English
• Published: Piscataway IEEE 2020; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Algorithms; Automata theory; Discrete Wavelet Transform; Discrete wavelet transforms; DNA; DNA coding; Encoding; Encryption; finite state machine; Finite state machines; Frequencies; Image coding; Image encryption; Image transmission; Security; Transforms; Wavelet transforms; Zigzag scanning curve
• ISSN: 2169-3536; 2169-3536
• DOI: 10.1109/ACCESS.2020.3045101

To better protect the image information, an image encryption algorithm based on block scrambling and finite state machine is proposed. The method uses discrete wavelet transform (DWT) to divide the original image into four frequency bands. Secondly, chaotic sequences and zigzag scanning curve are used to construct a scrambling matrix to scramble the four frequency bands. Then combine the chaotic sequence, DNA coding, and automata to transform the state of the scrambled image. Finally, the key stream is used to diffuse the sequence to improve the security of cipher images further. Experimental results and security analysis show that the proposed encryption scheme can resist various attacks and ensure the secure transmission of images.