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Cryptography and Network Security


Protection of sensitive information from adversaries has been a practice since centuries. As children, many of us had magic decoder rings for exchanging coded messages with our friends and possibly keeping secrets from parents, siblings or teachers. Sensitive information will be passed on between allies at war times. Cryptographic methods were traditionally used to prevent the enemy from learning sensitive military information.  As society has evolved, the need for more sophisticated methods of protecting data has increased.


The study of techniques needed to protect information is the field of Cryptography/Cryptology. Cryptanalysis deals with the methods required for breaking the protection.

Of course this is impossible without thorough understanding of the cryptographic method used for protection.

The course material has 4 modules. Module 1 begins with recent trends in security, overview of attacks and threats, standards in security services, mechanisms to provide security services. These topics are discussed in first two units of the module .

Later half of module 1 details two important methods of protecting data namely, substitution and transposition.  Units 1 and 2 of module 2 describe an important cipher method called DES (Data Encryption Standard) and attacks specially devised for this method.

In unit 3 variants of DES is discussed .The module concludes with stream ciphers in unit 4. Asymmetric encryption is the topic of discussion in module 3.

This covers the necessary background mathematics, public key crypto systems, RSA method, exchange of keys and digital signatures in various units.

The last module of the material touches upon, internet security, web security, password management, malicious software and firewalls.


File Type: PDF
File Size: 2.70 MB
Total Pages: 239

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