A combination of Rivest Shamir Adlemann (RSA) and Affine Cipher method on improvement of the effectiveness and security of text message

Abstract

Abstract Rivest Shamir Adlemann (RSA) method is one of the popular methods in the field of public key cryptography. The strength of the RSA method is based on the difficulty level of factoring of two large prime numbers. If they are factored easily, then we need to use brute force to break the system. In this present, we combined RSA method with classical method, namely Affine Cipher method to improve the level of security on text message. The process of combination RSA method and Affine Cipher method is as follow: first, text message was encryption using Affine Cipher method, then the encryption output is used as input of the RSA method. The results certified that the improvement of the security level of text message can be realized by using the combined method.