Image encryption technology protects the data security of transmitted images by encryption algorithms that apply keys to plain images to generate another form of image irrelevant to the plain image. Therefore, image information security has become a social research hotspot in recent years. As a visual representation of information carriers, digital images are frequently used in people’s daily network communication with their excellent visual characteristics. These issues disrupt the network order and threaten people’s private information.

For example, data transmitted over the network is intercepted and leaked by illegal users, maliciously tampered, and false information is sent with a legitimate identity. While the open and sharing nature of the Internet bring convenience, it also poses some potential security problems.

With the rapid developments of Internet and computer technology, digital network communication technology is widely used in various fields of society. Simulation results and security analyses demonstrate the effectiveness, security and robustness of the propose algorithm. Furthermore, the hyperchaotic multi-character system (MCS) is utilized to construct measurement matrix and control pixels. Regional energy embedding reduce the damage to the visual quality of carrier image, and the different embedding positions between images greatly enhances the security of the encryption algorithm. A method of hour hand printing (HHP) scrambling is proposed to increase the pixel irrelevance. Then, according to the regional energy, the secret image is embedded into a carrier image to obtain the final visual secure cipher image. The plain image is compressed and encrypted into a secret image by CS and zigzag confusion. In this paper, a visually secure image compression and encryption scheme is proposed by combining compressed sensing (CS) and regional energy. The network security transmission of digital images needs to solve the dual security problems of content and appearance.

Image block cipher decryption tool