Modifikasi Kriptografi Klasik Kombinasi Metode Vigenere Cipher dan Caesar Cipher

Abstract

Data security and confidentiality are still aspects that need to be considered in communicating. The absence of proper security procedures has led to many cases of data theft. Data theft often occurs in applications and communication networks, especially data in the form of text. The main cause of data theft in the form of text is the absence of proper security procedures. So we need a data encoding method or cryptography. Encryption or data encryption is one of the data security techniques that is often used. The cryptographic method is expected to minimize cases of theft or data eavesdropping. This study aims to provide security procedures for text data by combining two cryptographic methods, namely Vigenere Cipher and Caesar Cipher, in the process of combining the Vigenere Cipher and Caesar Cipher methods using different keywords. Vigenere uses a text key while Caesar uses a numeric shift as the key. In this study, the encoding with manual calculations and programs will be carried out. From the test results, it is found that the results of encoding by manual calculation have the same value as program calculations if the plaintext input uses capital letters. Based on the information capacity, it was found that the success rate of the test was 100% with 15 processing trials of up to 5000 plaintext and ciphertext characters