Document has an important role in the efficiency of time and work. Document is a media of information storage such as text, images, or graphics. The security aspect of important documents is necessary, unfortunately this aspect is usually ignored, even excluded. This case can cause serious problems and could be harmful to the owner of the document. This study aims to perform document security by using Asymmetric Cryptography Algorithm RSA (Rivest Shamir Adleman). The design of document security application is using Asymmetric Cryptography Algorithm RSA (Rivest Shamir Adleman). The process of securing documents was done with two types of keys: public keys and private keys that both locks can be set up to 1024 bits or more. The system was built by using Microsoft Visual C# 2010 software. The tests were conducted on thirty-six document samples. The result which can be obtained from this study indicates that the application of securing office document by using Asymmetric Cryptography RSA ( Rivest Shamir Adleman) algorithm with key length 1024 Bit succeeded in performing keyword generation function by changing the form of number and irregularly arranged random symbols and samples of encrypted documents in the text file format (*.txt).

Application Cryptography Document RSA (Rivest Shamir Adleman)