Encryption Scheme Based on DES-CFB Encryption with A Source-Joint Encryption

The joint-source encryption technology based on a multilevel diversity coding system in a multi-source network realizes information theoretic secrecy over the wiretap channel, and achieves threshold secrecy for the S-AMDCS system and prevents user overreach. However, this method is based on the assumption that all sources are independent binary sequences with the same rate, and the strong correlation between the pixels of the image is not fully considered. In order to solve the problem of information leakage in the image data with strong pixel correlation in the source-joint encryption system. To improve the anti-eavesdropping ability of image encryption, and generate an avalanche effect by enhancing the diffusion and confusion of information in the encryption process, this paper proposes a source-joint encryption scheme combined with DES-CFB stream encryption, and introduces a salt-based HMAC dynamic key generation mechanism and random initialization vector to ensure that the eavesdroppers are unable to recover the image content even if they can obtain multiple channels. The experimental results show that the proposed scheme significantly improves NPCR and UACI, and the difference between each pixel of the encrypted image and the original image is large, which improves the security of image transmission. In addition, the proposed scheme provides a powerful reference for the application of multimedia encryption, such as video encryption and medical image encryption.