Modifikasi Kriptografi Hill Cipher Kunci Matriks Persegi Panjang Menggunakan Fungsi Xor dan Fungsi Xnor

Modifikasi Kriptografi Hill Cipher Kunci Matriks Persegi Panjang Menggunakan Fungsi Xor dan Fungsi Xnor

• By Alawiyah, Tuti; Hikmah, Agung Baitul;
• Jurnal Nasional Terakreditasi
• 310
• 68-82

Cryptography is needed to store or transmit information/data. There are two important things in cryptography, which are, encryption (change an information into a form that will not be understood), and description (change the encryption back into the original message). The original message called as plaintext while the encryption form called ciphertext. Hill cipher is one of the cryptography algorithms that keeps developing. One of the development is the use of rectangle matrix as the key matrix. The use of rectangle matrix makes the ciphertext be longer than the plaintext. Those makes the message be more disguised. In this paper, the writer modifies the hill cipher algorithm by using the rectangle matrix in binary operation by adds the X-OR and XNOR logic. By adding the X-OR and XNOR logic, cryptoanalyst finds difficulties in the linier equation to find the plaintext and the key matrix. Binary operation makes the ciphertext be longer than the ciphertext in the rectangle key matrix only. Length of ciphertext is lc =((((2 * lp)/m * n) * 2)/m)*n. and ((2 * lp) mod m) =0. If ((2 * lp) mod m) ≠ 0 character of lp must be adds till ((2 * lp) mod m) =0.

• Katakunci Fungsi X-OR, Fungsi XNOR, Hill Cipher, Kriptografi
• URL https://ejournal.bsi.ac.id/ejurnal/index.php/ijcit/article/view/423/322
• Penerbit LPPM Universitas Bina Sarana Informatika, Jakarta Jawa Barat

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