Implementation of Cryptography Merkle-Hellman Knapsack Combination, Discrete Algorithm and ASCII Table Modification for PHP Source Code Security

Abstract

Abstract The PHP programming language is now widely used by agencies and companies around the world. To distribute applications made using PHP must use the source code so that it is prone to theft of works. If the source code is found by the programmer, it will be a big problem because it can indirectly find a hole in the security of a system from the source code. To solve this problem, the source code was coded so that the source code could not be easily copied by other parties. One of the ways to encode the source uses a combination of the Merklee-Hellman Knapsack algorithm, Discrete Logarithm and character modification to obtain complex encryption