PENERAPAN MODIFIKASI ALGORITMA VIGENERE CIPHER MENGGUNAKAN METODE CATALAN NUMBER DAN DOUBLE COLUMNAR TRANSPOSITION PADA APLIKASI CHATTING BERBASIS ANDROID

ZARTUJI, ZARTUJI (2019) PENERAPAN MODIFIKASI ALGORITMA VIGENERE CIPHER MENGGUNAKAN METODE CATALAN NUMBER DAN DOUBLE COLUMNAR TRANSPOSITION PADA APLIKASI CHATTING BERBASIS ANDROID. Skripsi thesis, Institut Teknologi Dirgantara Adisutjipto.

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Abstract

The chat application system generally only sends and receives data. Data sent and received in the form of text messages and in the form of image files. Lots of data text messages and image files that traffic on the internet network. Without realizing it, the data can be reviewed by irresponsible parties. Therefore data security is needed, so that the data is safe from negative matters. To secure the data, the method used is cryptography. So the security system created in the chat application uses a method of modifying the vigenere cipher algorithm. The modification is by using the catalan number to generate a new key, and then encrypted using the vigenere cipher algorithm. The results of the encryption are then randomized using the double columnar transposition method. The results of encryption and description testing can run with the labcar. In addition there are several other tests, namely testing the maximum limit of sent or received characters with a number of 4,116 characters, and the speed of data entering or appearing in the chat menu, with the increasing number of characters sent, the longer the message to enter or appear in the chat.

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