MODIFIKASI ALGORITMA VIGENERE CIPHER UNTUK PENGAMANAN PESAN RAHASIA

Jesmon  Simangunsong; zekson Arizona Matondang

Jesmon Simangunsong STMIK Kristen Neumann Indonesia
zekson Arizona Matondang STMIK Kristen Neumann Indonesia

Keywords: Secret Message Security, Cryptography, Vegenere Cipher algorithm

Abstract

The confidentiality of messages or data owned by someone is important in sending messages so
that the message can only be given by certain people who can access the information. Cryptography is
the study of how to safeguard data or messages with the aim of preventing others from wanting to know
their contents, by using certain codes and rules and other methods so that only authorized people can
find out the true contents of the message. In the Vigenere Cipher algorithm the message security uses
only a single key and the alphabet as an encoding key to replace or substitution the character of the
message which makes the strength in the message transmission limited only to the use of the alphabet.
In this research, the Vegenere Cipher algorithm was modified with 3 keys used and the vegenere cipher
table modified by adding numbers and 10 symbols so that the characters of the table are 46 characters
from the previous 26 characters. The results of this algorithm are able to encrypt secret messages and
decrypt them back into their original messages.