Cryptography: A Combination of Caesar and Affine Cipher to Conceal the Message

Abstract

Advances in technology make it easy for humans to communicate with each other. One of them is by sending messages. However, the confidentiality of messages can be hacked by third parties. Therefore, it is necessary to secure the messages sent so that confidentiality can be maintained. One way that can be done to maintain message security is cryptography. Classical cryptography has several types of algorithms including caesar cipher and affine cipher. The purpose of this study is to combine caesar cipher and affine cipher as one technique that can be used to secure messages. This combination is done by changing the plaintext into ciphertext 1 through caesar encryption. Ciphertext 1 is encrypted by affine caesar to produce ciphertext 2. Ciphertext 2 is the message to be sent. Then to change to original message ciphertext 2 is decrypted by affine chiper so that it gets plaintext 1. Then plaintext 1 is decrypted by caesar chiper so that it gets plaintext 2. Plaintext 2 is the message that should be received. The result of this study are a combination of caesar cipher and affine cipher can secure a message sent.

A combination of hill cipher and RC4 methods for text security

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Medical Image Encryption Using Dna Encoding and Modified Circular Shift

“…Data security has become the focus of research by scientists in the field of technology and information in this modern era. Therefore, a technique called encryption and decryption to secure data and information has emerged to communicate privately and maintain data confidentiality in the field of cryptography [3] [4].…”

A Cryptosystem of Skewed Affine Cipher of Multiple Keys

“…The system used to intensify the security over communication uses cryptology for its effectiveness. There is much advancement in this field where the combination of Hill cipher and Elliptic curve cryptosystem (ECC), the combination of Affine and Hill cipher (6) (10) has been witnessed to ensure that the security is magnified (2)(4)(5) (7) (8) (9). Elliptic Curve Cryptography (ECC) is one of the fields in cryptography that include Elliptic curves and points on it in a defined manner for performing encryption and decryption.…”