This is a C++ Program to implement Boyer-Moore algorithm. The idea of bad character heuristic is simple. The character of the text which doesn’t match with the current character of pattern is called the Bad Character. Whenever a character doesn’t match, we slide the pattern in such a way that aligns the bad character with … Read more
This is a C++ Program to implement Caesar Cipher Encryption algorithm. This is the simplest of all, where every character of the message is replaced by its next 3rd character. Here is source code of the C++ Program to Implement Caesar Cypher. The C++ program is successfully compiled and run on a Linux system. The … Read more
n computer science, the Aho–Corasick string matching algorithm is a string searching algorithm, it is a kind of dictionary-matching algorithm that locates elements of a finite set of strings (the “dictionary”) within an input text. It matches all patterns simultaneously. The complexity of the algorithm is linear in the length of the patterns plus the … Read more
This is a C++ Program to Implement Bitap Algorithm. The bitap algorithm (also known as the shift-or, shift-and or Baeza-Yates–Gonnet algorithm) is an approximate string matching algorithm. The algorithm tells whether a given text contains a substring which is “approximately equal” to a given pattern, where approximate equality is defined in terms of Levenshtein distance … Read more
This is a C++ Program to implement Vigenere cipher. The Vigenère cipher is a method of encrypting alphabetic text by using a series of different Caesar ciphers based on the letters of a keyword. It is a simple form of polyalphabetic substitution. Here is source code of the C++ Program to Implement the Vigenere Cypher. … Read more
This is a C++ Program to implement Affine Cipher. 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. The formula used means that each letter encrypts to one other letter, … Read more
This is a C++ Program to implement online search. The Wagner–Fischer algorithm is a dynamic programming algorithm that measures the Levenshtein distance between two strings of characters. For example, the Levenshtein distance between “kitten” and “sitting” is 3, since the following three edits change one into the other, and there is no way to do … Read more
This is a C++ Program to implement transposition technique. In cryptography, a transposition cipher is a method of encryption by which the positions held by units of plaintext (which are commonly characters or groups of characters) are shifted according to a regular system, so that the ciphertext constitutes a permutation of the plaintext. That is, … Read more
This C++ program performs naive string matching without using any specific library functions. A text and a pattern is given as input. The pattern is searched for in the text and all instances of the pattern are given as output. Here is source code of the C++ Program to Repeatedly Search the Same Text (such … Read more
This C++ program encodes any message using the technique of one time pad cipher technique. Input is not case sensitive and works only for all characters. White spaces are not ignored but are produced as random characters in the decoded message. Note:Since the key is required for decryption, it is printed on stdout. However, it … Read more
