Signature Security Development Utilizing Rivest Shamir Adleman and Affine Cipher Cryptographic Algorithms

Abstract: The purpose of this research was to secure images using only Base64 security and combining Affine Cipher and Rivest Shamir Adleman cryptography in image security. The research used a qualitative descriptive method, using document study procedures, natural observations and interviews to obtain and collect data. Meanwhile, software development techniques use the Rapid Application Development (RAD) method. The results of the study, hybrid cryptography which is a combination of Affine Cipher and Rivest Shamir Adleman cryptography methods are able to overcome weaknesses in securing Base64 encoding according to the tests that have been carried out. Weaknesses in Affine Cipher cryptography can be covered with Rivest Shamir Adleman cryptography so that the value of confidentiality is better maintained and the value of integrity is also better maintained because the use of asymmetric keys in RSA cryptography is difficult to solve. In comparison, hybrid cryptography is able to disguise signature image data well, but in terms of speed it takes longer and data memory usage becomes larger compared to using only Base64 encoding.