Exercise 1: Encrypt the plaintext below using the Caesar cipher: THE CAESAR CIPHER IS A TYPICAL EXAMPLE OF A SUBSTITUTION CRYPTOSYSTEM. t 19 22 w a 0 n 13 b 1 o 14 c 2 p 15 d 3 q 16 e 4 r 17 f 5 s 18 g 6 t 19 h 7 u 20 i 8 v 21 j 9 w 22 k 10 x 23 l 11 y 24 m 12 z 25 Encryption formula: f(x)= x+k (mod26) Character to be shifted to the right by k; x is the characterʼs
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Language used: VB script It’s a simple code written in notepad‚ which can encrypt and decrypt text that can be sent as secret message. First line in the code creates a dialogue box that asks for a text to encode. Submitted text is then reversed. Next the %windir%\notepad opens up an instance of Notepad to print the results after waiting for 1 second. Then a function is written that encodes the text by advancing each character by 3 letters. Same procedure is followed in the decryption code.
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Enhancing Security using Cryptography with Matrices P.Sai Tejesh 12bce0359 VIT University Ph. No: 7502935512 Abstract : Cryptography is the study of encoding and decoding secret messages. In the information age‚ cryptography has become one of the major methods for protection in all applications like cloud computing‚ mobile security. It allows people to do business electronically without worries of deceit and deception. When people started doing business online and needed to transfer
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HILL CIPHER TERM-PAPER 3/31/2013 LPU vidit Name: Vidit kumar Singh. Reg no: 11009010 Roll no: B38. Cap : 323. Sub : Information Security and privacy. INDEX Introduction Workings Decryption Matrix Inverse Hill ciphers that encipher larger blocks Ciphertext Attack Known plaintext attack Security Key size Diffusion and Confusion Conclusion References Hill Cipher Introduction Invented by Lester S. Hill in 1929‚ the Hill cipher
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Brittany Lewis Cryptology and Cipher Codes Math Fair Report In a world where identity theft is on the rise‚ hackers are hard at work trying to get people’s credit card numbers‚ and where companies are getting your information to sell you unwanted things‚ tight security has become a large factor of keeping the personal and confidential information of our society safe. Cryptology and Cipher codes are commonly used ways to keep confidential information protected by preventing
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that can break it have demonstrated exhaustive key search attacks can use Triple-DES – but slow‚ has small blocks US NIST issued call for ciphers in 1997 15 candidates accepted in Jun 98 5 were shortlisted in Aug-99 Rijndael was selected as the AES in Oct-2000 issued as FIPS PUB 197 standard in Nov-2001 AES Requirements private key symmetric block cipher 128-bit data‚ 128/192/256-bit keys stronger & faster than Triple-DES active life of 20-30 years (+ archival use) provide full specification
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Substitution and transposition ciphers are two categories of ciphers used in classical cryptography. Substitution and transposition differ in how chunks of the message are handled by the encryption process. Substitution ciphers encrypt plaintext by changing the plaintext one piece at a time. Transposition ciphers encrypt plaintext by moving small pieces of the message around. A transposition cipher doesn’t change the characters in the plaintext when it generates the cipher text‚ it just re-arranges them
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Vigenère cipher is a method of encrypting alphabetic text by using a key known as a running key‚ which is generated by a keyword. In a Caesar cipher‚ we have to shift every letter of the alphabet with other number of places The Vigenère cipher consists of many Caesar ciphers in sequence with different shift values. The Caesar cipher with digraph coding provides a means of increasing the key space from 26 to 676 ‚ so the key can take any value between 0 and 675 . ( 2 ) This digraph cipher much harder
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Introduction Alberti- Vigenere Cipher In the 1400’s a man named Leon Battista Alberti invented a Cipher disk which was to be used to encrypt information. The cipher disk was a mechanical device which allowed different substitution methods due to its incorporation of sliding disks. The mechanism used in making the disk is currently used as a poly alphabetic cipher base concept. This is an encryption method where several substitution ciphers are switched throughout the encryption. In the 1500’s a
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Thomas Jefferson Have you ever wondered how the wheel cipher worked‚ who made it‚ and how has it helped people? Thomas Jefferson was an inventor and a president of the United States. His invention of the wheel cipher helped translate hidden words‚ improve spy work‚ and it helped soldiers receive plans in letters secretly without the enemy knowing what it meant. The effectiveness of the word cipher was due to Thomas Jefferson’s desire to learn‚ his creativity in problem solving‚ and his desire to
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