Performance of Combining Hill Cipher Algorithm and Caesar Cipher Algorithm in Text Security

In data security, a technique is needed to secure data from experiments and attacks by cryptanalysts. The technique of securing data is also known as cryptography. In this research, it has been done to improve data security by combining the Hill Cipher Algorithm with the Caesar Cipher Algorithm. This process can be seen from the tests that have been carried out in this study. The result is in a different and sufficiently improved processing time both in terms of decryption and encryption. By combining the two cryptographic algorithms, it is known that message security is much better. It occurs because the encryption and decryption process of the message is carried out using 2 different keys. Based on the tests, it shows that the time of the encryption process with the decryption process on the $5\times 5$ matrix key is very different from using the $3\times 3$ matrix key, the difference is slightly different in time. It shows that the use of a larger matrix key affects the decryption process is very long and also influenced by other cryptographic algorithm processes. In this study, another cryptographic algorithm is the Caesar Cipher Algorithm.