Enhancing File Security by using Vigenere Cipher and Even Rodeh Code Algorithm

Abstract

The development of technologies has produced new applications to facilitate humans in the process of sending files. Because the ease of these applications is accessed by humans, then it is possible for unresponsible parties to manipulate the data. On the other hand, the size of data also takes a significant aspect of the delivering process. One solution that can be done to overcome the problem is by using the combination of cryptography and compression techniques. Cryptography refers to the encryption section which builds a method for sending secret messages. Compression is a process to reduce the size of the data. Therefore it can store more data and speed up the data transmission process. The algorithms used in this research are Vigenere Cipher and Even-Rodeh Code. This system is built using the C# programming language. The results show that file security using Vigenere Cipher cryptography and Even-Rodeh code compression algorithm can restore the original file contents completely. Vigenere Cipher algorithm testing shows that the average time of the encryption process is 0.2375 KB/ms and decryption is 0.2902 KB/ms. The Even-Rodeh Code algorithm testing shows that the size of compression file in some experimental samples of different sizes is directly proportional to the size of initial file before being compressed, with an average time of compression is 338.8 milliseconds, Ratio of Compression is 1.02, Compression Ratio is 97.14%, Space Saving is 2,85%, and Bitrate(BR) is 9920.27.