Using AES and DES Cryptography for System Development File Submission Security Mobile-Based

The purpose of this study is to develop a system for the security of submission word, excel, and pdf files implementation to LPPPTK KPTK Gowa. The method used is AES and DES cryptography, AES cryptography is a symmetry algorithm that uses the same key for the encryption and description process, and DES cryptography is included in the symmetry and cryptographic systems classified as a type of block cipher. The previous study has been conducted to secure file submission in word form and excel using the blowfish algorithm and AES cryptography. The results of this study indicate that by developing a mobile-based file delivery security system using AES and DES Cryptography, the data in a file can be encrypted so as to avoid interference from unauthorized parties and to keep the contents of the data from a file sent safely. The encrypted file types are not the only word and excel files, but in this study can also be used for pdf files. Based on functional testing, valid results are obtained, the file transfer system has been running in accordance with the results of the testing factor and can function properly and also to test the file transfer logic using AES cryptography and DES error-free logic.