Modifikasi Vigenere Cipher Menggunakan Grup Simetri untuk Mengamankan Pesan Teks

Cryptography is widely used to overcome information security problems that are exchanged on the internet network. One of algorithms in cryptography Vigenere Cipher, algorithm known as a robust method and not easily solved. However, Cipher has weakness, namely key short repeatedly. Therefore, it necessary modify Cipher. The purpose this study determine modification using symmetric group also level encryption results when compared obtained from research new process groups. modified proven be stronger than This because plaintext scrambled first encoding, so actual safe against attacks by Kasiski exhaustive search. In addition, resulting supports use capital letters, lowercase numbers, symbols.