An Inquiry Into Information Hiding Systems On Digital Image Based On Public Cryptographic Algorithms

With the popularized application of computer and network, safety has becomean urgently problem. Now the information hiding technology is the most importantdefendable means to carry out the secrecy communication and difference electrontransactions on the network, to protect the property right on knowledge, etc. It is thetypical utilization to embed the important information into the carrier, such as themultimedia data, to implement the corresponding security on the common channel. Itdepends on the sensory redundancy on the human being and in the computermultimedia data to secrete the fact of the important informant existence.Today, the research of information hiding technology has become expending.The main research has changed from the essence ways to construct the theory model,systemic frame and utility system.This thesis discusses the theoretical models and some key techniques. Theseinformation hiding's systems on digital image we practiced based on space fields,DCT frequency fields, and cryptographic algorithms on Matlab. The utility model,the systemic frame on network, and the hiding technology based on publiccryptographic algorithms which we constructed are followed the Kerckhoffsprinciple, the digital signature, authentication technology, and so on. Being thesecurity, authentication, extension and validity, they will have good applicationforeground to support the electron transaction applications, and protect the propertyright on Internet.