Vigenere Cipher Using Plaintext Modification

  • Dwi Rahmasari Kinasih Gusti Universitas Jember
  • Kiswara Agung Santoso Universitas Jember
  • Ahmad Kamsyakawuni Universitas Jember


Cryptography is knowledge of encoding messages by observe to security aspects. Cryptography uses two types of keys, namely symmetric keys and asymmetric keys. Vigenere cipher is a technique to encrypt messages by symmetric key. Vigenere cipher can be combined by several patterns and ASCII code. The pattern used can vary as long as the text can be returned to original message (can be decrypted). On this paper, we will modified plaintext before encrypt using vigenere cipher. The way to modified the plaintext are flip and shift rows of bit. The effect of the algorithm changes can be seen based on the renewal value obtained. If the correlation value gets smaller, it means the algorithm is better. The results of this study is the correlation value using vigenere cipher with modified plaintext is better compared to vigenere cipher with original plaintext.
Keywords: ASCII, Patterned, Bits, Vigenere Cipher

How to Cite
GUSTI, Dwi Rahmasari Kinasih; SANTOSO, Kiswara Agung; KAMSYAKAWUNI, Ahmad. VIGENERE CIPHER DENGAN MODIFIKASI PLAINTEXT. Majalah Ilmiah Matematika dan Statistika, [S.l.], v. 20, n. 1, p. 15-26, mar. 2020. ISSN 2722-9866. Available at: <>. Date accessed: 17 june 2024. doi: