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Multiple-valued logics (MVL) have abundant operation functions which can be used for encryption. A reconfigurable MVL operator can perform all MVL functions with a universal circuit structure at fast operation speed, based on which a one-time-pad cryptosystem is expected to be built. However, we find that when the existing MVL encryption method is applied to video data encryption, the color edges in the plaintext image will remain in the ciphertext image, resulting in partial leakage of information. To solve this problem, we propose byte reorganization and random mask strategies, forming an improved MVL encryption method for video streaming. For verifying the effectiveness of the method, we implement an FPGA-based experimental system to encrypt and decrypt real-time video streaming data. In this system, 16-quit reconfigurable quaternary logic operators are implemented to encrypt, decrypt and derive keys. Byte reorganization is achieved by double buffering in pipelined mode and random mask is generated by linear feedback shift register. The process of either encryption or decryption only takes 34 clock cycles. The system captures 1920&#x00D7;1080&#x00D7;30 pixel/s video streaming data by a camera, where the encryption and decryption modules are capable of processing streaming data at a speed of 6.21 Gbit/s, showing that the system has real-time processing capability. Experimental results show that our method solves the problem of remained color edge and the ciphertext exhibits good statistical properties. We also compare our improved MVL encryption method with existing image encryption methods in terms of common security evaluation metrics including histogram, peak signal-to-noise ratio (PSNR), correlation coefficient, number of pixels change rate (NPCR) and uniform average change intensity (UACI), proving that our method is secure.

A Video Streaming Encryption Method and Experimental System Based on Reconfigurable Quaternary Logic Operators