System for Image Compression and Encryption by Spectrum Fusion in Order to Optimize Image Transmission

For any transmission of fast and protected information, it is necessary to carry out two operations distinctly. The first one, is an operation of compression which consists in reducing the size of information to be transmitted, by removing redundant information of them. The second one is an operation of encryption, which aims to modify this compressed information to make them unreadable to whoever does not have the necessary authorization to see them. However, these two operations are often carried out separately, although they are strongly bound and one influences the other. In this article, we propose to carry out these two operations (compression and encryption) together with a new system able to amalgamate spectral information. This spectral fusion, nondestructive, allows the compression and the encryption of this information at the same time. This system is based on the discrete cosine transformation "DCT", a transformation used for a long time in JPEG compression.