Implementation and Comparative Analysis of Symmetric Encryption Model Based on Substitution Cipher Techniques

nowadays, the need to protect information from various attackers is growing. There are asymmetric cryptographic algorithms that offer a good security rate, but at the same time, they consume a lot of system resources and need more encryption time. It is very important to create an algorithm that will have a high level of security and which can be easily implemented in the system. The purpose of this paper is to describe a novel cryptosystem. The encryption algorithm is evaluated according to speed, entropy level, security, and encrypted text size. To evaluate the proposed algorithm, the comparative analysis was done. For comparison, the AES and RSA cryptosystems were used. Experimental research has shown that the proposed cryptosystem has good results in the following criteria: encryption speed, flexibility, needs low system requirements, the ciphertext size. According to the given algorithm, using modern programming technologies we have developed the web application. This software product is easy to implement and fast for use. Experimental research results showed that the proposed encryption method can highly improve transferred information security and has good encryption speed than AES and RSA. To evaluate security and resistance, frequency analysis and entropy research was conducted. Analysis showed that the proposed cryptosystem has a good security level. Security analysis demonstrates that our scheme is secure.