The Research, Design And Implementation Of Encryption Technology On Special Control Of Computer

Encryption technology is very important in special control of computer management system. It’s the sensitive information’s important line of defense. Encryption technology in special control of computer management system must be designed by ourselves. In this paper, I do the research, design and implementation of encryption technology on special control of computer.The author has seriously studied the block cipher system, conducted an in-depth research of provable security and practical security. Based on the learning and analysis of the block cipher which existing home and abroad, a new block cipher algorithm is proposed, which is Feistel cipher containing SPS structure. It’s provable security and practical security against differential and linear cryptanalysis. By comparing GFN-SPS and GFN-SP structure for in-depth detailed comparison, we get GFN-SPS structure’s large advantage in active S box.Visual cryptography is an effective complement to traditional encryption technology, which is represented by block cipher. It’s irreplaceable. In computer, visual cryptography is work in image form, so it has the advantages of high information content and flexible form of secret information. When computer is insecurity or computer can’t use, it can still play its important value, because it decrypt by human eye’s visual system. In this paper, based on digital watermarking, we propose a new visual cryptograph scheme with meaningful shares. The scheme does not change the original pixel expansion, and not only applies for black and white binary images, but also for any gray and color images. Meanwhile, the embedded image in a meaningful share is robust. The scheme is highly feasible.