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