a should have no factors in common with m). a should be chosen to be relatively prime to m (i.e. The following discussion assumes the use of a 26 character alphabet (m = 26).
The ‘key’ for the Affine cipher consists of 2 numbers, we’ll call them a and b. In the affine cipher, the letters of an alphabet of size m are first mapped to the integers in the range 0 … m-1. The whole process relies on working modulo m (the length of the alphabet used). The formula used means that each letter encrypts to one other letter, and back again, meaning the cipher is essentially a standard substitution cipher with a rule governing which letter goes to which. The Affine cipher is a type of monoalphabetic substitution cipher, wherein each letter in an alphabet is mapped to its numeric equivalent, encrypted using a simple mathematical function, and converted back to a letter. Program to print all substrings of a given string.stringstream in C++ and its applications.Reverse string in Python (5 different ways).Longest Palindromic Subsequence | DP-12.Given a string, find its first non-repeating character.C Program to Check if a Given String is Palindrome.Length of the longest substring without repeating characters.Check whether two strings are anagram of each other.Array of Strings in C++ (5 Different Ways to Create).Python program to check if a string is palindrome or not.Different methods to reverse a string in C/C++.Check for Balanced Brackets in an expression (well-formedness) using Stack.Write a program to print all permutations of a given string.Write a program to reverse an array or string.ISRO CS Syllabus for Scientist/Engineer Exam.ISRO CS Original Papers and Official Keys.GATE CS Original Papers and Official Keys.
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