Analyzing of Modified DES-64 Algorithm for Securing the Data on File Storage Systems

Information System Department, Institut Teknologi Nasional Bandung, Indonesia

^* Corresponding author: aseprizal@itenas.ac.id

Abstract

Rapidly developing technology makes it easier for us to get information from processed data. The authenticity of a data is a very basic thing of information. With the rapid development of technology, there are more and more threats such as manipulate, phishing or even deleting data that will be processed into information without authentication. Guaranteeing the confidentiality and authenticity/integrity of data in the form of files is very important to produce accurate information and can be accounted for by way of encryption or one way function for authentication. The goal is of course to make it difficult for other parties to change it. The ultimate goal of this study is to implement the modified des 64 algorithms, to compare the avalanche effects and randomness test values from the standard DES test results with modified DES on the S-Box and P-Box sections which are made dynamic depending on the key, so that the data stored is encrypted. The modification process is by entering several key combinations including the DES weak key, alphabet and alphanumeric. The implementation is carried out on document file storage with a user authentication process and file encryption with a key that uses sha-256 to generate a different key for each file. When the owner downloads the data, the decryption process is executed, so that the security and authenticity of the data can be guaranteed. With the modified 64-bit DES, it is expected that data security problems on storage can be decreased or even solved.