Applied Research Of Contemporary Cryptography In Network Digital Film Enlargement System

A secure network system should ensure the integrality and confidentiality of the data non-repudiation. Data encryption is the most core techniques for the safety of the information. The thesis focuses on the application of the modern cryptography in network digital film enlargement system. Points out the need of systematic safety and discusses the cryptography; Shows the ways of information safety practice applied by the Win CryptoAPI; Improves the stream cipher RC4; Gives the readers the concrete design of the system digital certification referred by ITU X509; Makes the complete safety information protocol based on the special characters of the Network Digital Film Enlargement System and on TCP/IP. The protocol includes the key exchange, authentication, symmetric key cryptography, check of the information integrity, digital signature and the exchange of the information. And it is a practical information safety protocol. It also suggests the reference value for other protocols of the network safety.