A Robust Encrypted Nanocommunication in QCA Circuit

Abstract

Quantum-dot cellular automata (QCA) is an alternative technology developed to address the fundamental limitations of CMOS technology. This technology is attractive owing to its low power consumption, fast speed, and small dimensions. Cryptography can be a promising application of QCA technology. This paper describes a new way to generate encrypted patterns in QCA that can be helpful in QCA-based secure nano communication. We employed the round robin algorithm for encrypting data in nano communication. The proposed method is useful because it can be employed for the transmission of cipher text obtained using QCA without any limitation on the length of bits in a message. This method can also be used for creating encrypted patterns with high flexibility and scalability.Moreover, in this paper, a novel approximate eight-input majority gate is proposed, making it the first majority gate with even entries. This gate is suitable for designing digital logic circuits, such as priority encoders. However, this design is implemented in a single layer with only 13 cells. The proposed architecture of the majority gate was evaluated and simulated using the QCADesigner tool (version 2.0.3). The results showed 93% accuracy with eight inputs, which result in 256 states. Furthermore, one of these encrypted patterns was used for secure transmission the results approximate eight-input majority gate while considering error states that were recognized in the simulation as encryption keys; thus, we conducted error corrections accordingly.