| Course Name | Data Security |
| Course Code | 15ECE363 |
| Program | B. Tech. in Electronics and Communication Engineering |
| Year Taught | 2019 |
Introduction:History of Cryptography. Mathematical background: Probability theory -Information theory – Complexity theory, Number theory. Symmetric (Private) Key Cryptographic Systems: Caesar – Aff ine – Monoalphabetic Substitution – Transposition – Homophonic substitution – Vignere – Beauford and DES Family – Product ciphers – Lucifer and DES.
Asymmetric (Public) Key Cryptographic Systems: Concept of PKCS, RSA Cryptosystem- Variants of RSA – Primality testing – Security of RSA – Merkle – Hellamn – Security of Merkle – Hellaman, ElGamal. Elliptical Curve Cryptography. Stream ciphers and block ciphers: The one time pad – Synchronous stream ciphers – Self-synchronizing stream ciphers – Feedback shift registers – Linear Complexity – Non-linear feedback shift registers – Stream ciphers based LFSRs. Non-linear Combination generators – Non linear filter generators – Clock controlled generators – The alternating step generators – The shrinking generators.
Digital Signatures: Properties, Generic signature schemes – Rabin Lamport – Matyasmeyer, RSA – Multiple RSA and ElGamal Signatures – Digital signature standard – Blind Signatures- RSA Blind. Secret Sharing Algorithms: Threshold secret sharing – Shamir scheme, Blakley scheme and modular Scheme. Pseudo random number generators: Definition of randomness and pseudo-randomness – Statistical tests of randomness – Linear congruential generator – Modern PRNGs (a brief description).
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