PN序列产生-讲义Guang Gong Dept. Electrical and Computer EngineeringDesign of Pseudo-random Sequence Generators (Cont.)Lecture 2: n Design of PRSGs Towards Large Linear Span n Applications in Stream Cipher Design: A5 and w7Lecture 2@ G. Gong13. Design of PRSGs Towards Large Linear Span One-time-pad and Design Principles of Stream Ciphers Known Approaches for Design of PRSG Based on LFSRLecture 2@ G. Gong2Cryptanalyst^ c ^ kMessage sourcemEncryptercDecrypterDestinationkSecure channelKey generatorModel of Conventional CryptosystemLecture 2 @ G. Gong 3Model of Stream CipherMessage sourcem = m1, m2, ...Cipherc = c1 , c2, ... + k = k1, k2, ...Key generationK, seedLecture 2@ G. Gong4One-time-padOne-time-pad means that different messages are e……