An Enhancement to Caesar Cipher using Euler Totient Function
Rajalaxmi Mishra1, Jibendu Kumar Mantri2

1Rajalaxmi Mishra, Faculty, College of IT & Management Education CIME, Bhubaneswar (Odisha), India.
2Dr. Jibendu Kumar Mantri*, Department of Computer Application, North Orissa University, Baripada, (Odisha), India.
Manuscript received on January 15, 2022. | Revised Manuscript received on January 24, 2022. | Manuscript published on February 28, 2022. | PP: 46-50 | Volume-11 Issue-3, February 2022. | Retrieval Number: 100.1/ijeat.C33630211322 | DOI: 10.35940/ijeat.C3363.0211322
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Abstract: In this modern world every communication including financial transactions are taking place through the open unsecured network. In order to communicate securely through open networks the messages need to be concealed by using the cryptographic methods. The mono alphabetic traditional Cipher is Caesar cipher is the simplest and fairly popular among the available cryptographic algorithms but it is prone to brute force attack and frequency analysis test. In this paper we propose an enhancement to Caesar cipher by using the Euler Totient function to generate the key to encrypt a text file. The Euler Totient function is applied on the total number of lines of the plain text file. The key value is generated from the plain text hence for different plain text the key value is different; this makes it difficult for the adversary to guess the key thus making the encryption scheme robust. It needs to design secured key distribution schemes to be taken up as the extension work of this scheme. 
Keywords: Caesar Cipher, Euler Totient Function, Key Generation Process, Modular Arithmetic.
Scope of the Article: Software Defined Networking and Network Function Virtualization