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 Encryption Standard ( AES) Block Cipher Modes of Operation Stream Cipher and RC4 Module...
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Intruduction - Computer and Network Security

Computer and network security are essential for several reasons, driven by the increasing reliance on digital systems and the growing sophistication of cyber threats. Here are some key needs for computer and network security: Protection of Data : To safeguard sensitive information such as personal data, financial records, intellectual property, and confidential business information from unauthorized access and breaches. Prevention of Cyber Attacks : To defend against various forms of cyber attacks including malware, ransomware, phishing, and denial-of-service attacks that can disrupt operations and cause significant damage. Integrity of Information : To ensure that data remains accurate and unaltered during transmission or storage, protecting it from tampering or corruption. Confidentiality : To ensure that information is accessible only to those authorized to have access, protecting it from unauthorized disclosure. Availability of Services : To ensure that computer systems and network...
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Playfair Cipher

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The best-known multiple-letter encryption cipher is the Playfair, which treats digrams in the plaintext as single units and translates these units into ciphertext digrams.The Playfair algorithm is based on the use of a 5 × 5 matrix of letters constructed using a keyword. Here is an example, solved by Lord Peter Wimsey In this case, the keyword is MONARCHY . The matrix is constructed by filling in the letters of the keyword (minus duplicates) from left to right and from top to bottom, and then filling in the remainder of the matrix with the remaining letters in alphabetic order. The letters I and J count as one letter. Plaintext is encrypted two letters at a time, according to the following rules: 1. Repeating plaintext letters that are in the same pair are separated with a filler letter, such as x , so that balloon would be treated as ba lx lo on . 2. Two plaintext letters that fall in the same row of the matrix are each replaced by the letter to the right, with the first elemen...
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