Digital signature technique with quantum-dot cellular automata

Quantum-dot cellular automaton (QCA) is efficient nanotechnology that may be used as an alternative to Complementary Metal Oxide Semiconductor technology. Here, computation relies upon the electron's polarisation, revealing binary information. Quantum-dot cellular automaton is an appropriate opportunity for the upcoming age of advanced digital frameworks. Security in transferring data is essential since a lot of valuable information is present. Digital Signature is a process where data is transferred from a receiver to an authenticated sender only. In this paper, tile-based Exclusive NOR gate (XNOR) is designed, which is more stable than the regular majority gate-based circuit. It is used to create a novel circuit for authentication of data which is based on tiles. It develops a QCA architecture that works on the principle of Digital Signature. The architecture validates and proves the authentication of the message sent from the sender to the receiver. The decrypted digest and the converted digest of the original dispatch are compared in the proposed Digital Validator circuit, which is developed utilising a QCA XNOR gate. The security for communication at the nanoscale level is enhanced due to the use of the SHA-256 algorithm. The simulation results confirm the theoretical results.