Reversible Vigenere Cryptographic Cipher in Quantum-Dot Cellular Automata

Abstract

Using cryptography to protect and securely transmit data is crucial in today's environment. Data theft is inescapable; we must encrypt and decrypt messages to prevent data abuse and ensure that only the intended recipient can access the information. One such encoding method is the Vigenere Cipher algorithm, where we employ reversible logic to implement this approach in this paper. In the realm of VLSI, Quantum Dot Cellular Automata (QCA) is proving to be a better solution to CMOS and preferable for creating reversible logic. The Vigenere Cipher approach improves data security when used with reversible logic. This encryption and decryption circuit are designed using Peres and DG gates in QCA. It comprises 38 and 40 cells and includes a single layer. It has been demonstrated that the circuit reduces cell count and area. In this scenario, the QCADesigner tool is used for design and verification.