Collaborative encryption algorithm between vigenere cipher, rotation of matrix (ROM), and one time pad (OTP) algoritma

Abstract

Cryptography is still developing today. Classical cryptography is still in great demand for research and development. Some of them are Vigenere Cipher and One Time Pad (OTP) Algorithm. Vigenere Cipher is known as the alphabet table used to encrypt messages. While OTP is often used because it is still difficult to solve. Currently there are many ways to solve the Vigenere Cipher algorithm. OTP itself has constraints with the distribution of keys that are too long. The key length in the OTP algorithm is the same as the plaintext length. Key random creation also increases the intensity of key distribution. This requires a secure network at a high cost. The key repeater also lowers the message security level. EM2B Key algorithm is able to overcome key problem in OTP. EM2B and Increment of Key (Lk) collaborations produce key lengths equal to plaintext. The Rotation of Matrix (ROM) algorithm contributes to manipulating the length of plaintext characters. ROM works with Square Matrix tables that also scramble the contents of plaintext. The addition of Vigenere Cipher further enhances plaintext security. The algorithm was developed with the EnC1 function, Subrange (Si), and Length of Plaintext (Lp). This research produces a very strong ciphertext. Because plaintext undergoes four stages of encryption to become cipherteks. Then the length of the plaintext changes with the number of cells in the matrix. The value of Si and Lp is added to the plaintext to be a flag for the decryption process.