A Modified RAES Technique for a Secured Information Security

Abstract

The word ‘Cryptography’ according to Stallings (2017), is derived from a Greek word meaning secret writing. In cryptography plain text is transferred to cipher text using encryption techniques, this process is called encryption. And converting cipher text to plain text using decryption techniques, this process is called decryption. There are several conventional cryptographic methods, and because it is possible to crack cipher text. Many cipher techniques have developed but the Rail Fence Cipher (RFC) is the simplest and amusing cryptographic algorithm until now (Nahar & Chakraborty, 2020). RFC is a type of transposition techniques. Meanwhile, there is another technique called Advanced Encryption Standard (AES). The AES algorithm is one of the symmetric key block digits with block sizes varying from 64 to 256 bits (Burr, 2003). Some AES applications continue to struggle for low performance areas such as smart cards and cellular phone-related hardware. Therefore, encryption speed and execution times are two important factors for the real-time use of AES algorithms. The problem with the use of AES is the compromise between the speed of encryption and decryption and execution time where there is more confusion and diffusion. Furthermore, AES is said to use an algebraic structure which is too simple and each block is always encrypted in the same way that making it easy to break (Tillich et al., 2008; Stalling, 2017). Therefore, this paper proposes a new approach called the RAES technique, which results from redesigning the current RFC using two basic phases, first using the AES technique and then using the potential of the RFC technique to protect confidential messages for more secure information security.