Introducing you the topics of CRYPTOGRAPHIC & NETWORK SECURITY . (UNIT-1) in very summarized way. These notes are provided by Ms Ruchi Khetan (Assistant Professor), KIOT, Kanpur.
Content:Introduction to security attacks, services and mechanism, Classical encryption techniques-substitution ciphers and transposition ciphers, cryptanalysis, steganography, Stream and block ciphers.
Modern Block Ciphers: Block ciphers principles, Shannon’s theory of confusion and diffusion, fiestal
structure, Data encryption standard(DES), Strength of DES, Idea of differential cryptanalysis, block
cipher modes of operations, Triple DES.