The Application of MS. Office File Protection using DES (Data Encryption Standard) Algorithm

Abstract

Microsoft Office is an office suite that is very popular in the computer users. Microsoft Office with a word processing application (MS. Word), a spreadsheet application (MS. Excel), a presentation application (MS. Powerpoint) and database applications (MS. Access) is widely used to store various kinds of data/information that is useful and important, and can also be confidential. To prevent the accessing of data/information that is important and confidential by an unauthorized person, then applied the security system. Security of data/information is more often carried out by security when accessing it using a password.To secure the data/information stored in a file, have developed a way to implement encryption techniques. This technique implements a permutation technique carried out repeatedly, to obtain results that are not recognizable anymore. To know the original form, applied decryption techniques, which is the opposite of encryption step. In this study the technique implemented is DES encryption with algorithms that belong to the symmetric cryptographic systems and classified the type of block ciphers. Based on the results of testing of applications developed, it turns encryption technique that utilizes DES algorithm can be used to secure all file types of MS. Office 2007 version. Encrypted files were not identifiable and can not be accessed simultaneously by the program creators, namely MS. Word, MS. Excel, MS. Powerpoint and MS. Access.