The development of partial encryption of compressed images algorithm: VHDL approach

This paper describes the development of novel algorithm of a partial encryption of compressed images intended for efficient hardware implementation. The compression algorithm decomposes images into several different parts while a secure encryption algorithm is then employed to encrypt only the crucial parts, which are considerably smaller than the original image. We use the breadth-first traversal linear lossless quadtree decomposition method for the partial compression and RSA is used for the encryption. VHDL modeling of the algorithm is implemented and simulated. Functional simulations are carried out to verify the functionality of the individual modules and the system on several different images. This algorithm has the potential of being extended to use other kind of compression algorithm such as lossy quadtree and SPIHT.