University Question Papers CST 393 Cryptographic Algorithms

 

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Cryptographic Algorithms CST 393 KTU CS Honour Notes Semester V -Dr Binu V P

About Me About the Course and Scheme Syllabus Model Question Paper University Question Papers ******************************************************** Module-1 (Introduction to the Concepts of Security) Introduction CIA Triad  OSI Security Architecture Security Attacks Security Services Security Mechanisms Model for Network Security Classical Encryption Techniques     Symmetric Cipher Model     Cryptography -  Crypt Analysis Substitution Ciphers-Caesar Cipher     Mono-alphabetic Ciphers     Playfair Cipher     Hill Cipher Poly Alphabetic Ciphers- Vigenere Cipher     Vernam Cipher- One Time Pad Transposition Ciphers Module-2 (Symmetric Key Crypto Systems) Stream Cipher Vs Block Cipher Traditional Block Cipher Structure- Fiestel Structure Data Encryption Standard - DES Algorithm Differential and Linear Cryptanalysis Double DES and Triple DES International Data Encryption Algorithm ( IDEA) Advanced Encry...
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Data Encryption Standard - DES Algorithm

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The Data Encryption Standard (DES) was the most widely used encryption scheme. DES was issued in 1977 by the National Bureau of Standards, now the National Institute of Standards and Technology (NIST), as Federal Information Processing Standard 46 (FIPS PUB 46). The algorithm itself is referred to as the Data Encryption Algorithm (DEA). For DEA, data are encrypted in 64-bit blocks using a 56-bit key. The algorithm transforms 64-bit input in a series of steps into a 64-bit output. The same steps, with the same key, are used to reverse the encryption. Key Concepts of DES Symmetric Key Algorithm : In DES, the same key is used for both encryption and decryption . This key must be shared between the sender and receiver securely. Block Cipher : DES operates on fixed-length groups of bits, called blocks . The block size for DES is 64 bits . The input data is divided into 64-bit blocks, which are encrypted one block at a time. Key Length : DES uses a 56-bit key (though 64 bits are sup...
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OSI Security Architecture

To assess effectively the security needs of an organization and to evaluate and choose various security products and policies, the manager responsible for security needs some systematic way of defining the requirements for security and characterizing the approaches to satisfying those requirements. This is difficult enough in a centralized data processing environment; with the use of local and wide area networks, the problems are compounded. ITU-T Recommendation X.800, Security Architecture for OSI, defines such a systematic approach.The OSI security architecture is useful to managers as a way of organizing the task of providing security. Furthermore, because this architecture was developed as an international standard, computer and communications vendors have developed security features for their products and services that relate to this structured definition of services and mechanisms. The OSI security architecture focuses on security attacks, mechanisms, and services. These can be d...
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