Combining caesar cipher and hill cipher in the generating encryption key on the vigenere cipher algorithm

Abstract

There is a risk in the process of exchanging information, especially text information. To reduce that risk, one of cryptographic method can be applied. That is Vigenere Cipher algorithm. But the Vigenere Cipher algorithm have a weakness. The weakness is a repetitive encryption key. It causes the chipertext to be predictable with the Babbage-Kasiski method. By combining Caesar Cipher and Hill Cipher methods in the process of generating the encryption key, its expected to cover up the weakness of the Vigenere Cipher method. The combination has the capability to hide the character appearance’s frequencies.