Abstract:
With the widespread use of the internet, there is a need to secure the communication channel through Cyber-Physical
Systems as they carry essential information, for which we rely upon various cryptographic algorithms. With the advancement of
Quantum Computers, security-related public-key encryption methods would become ineffective. Furthermore, the critical research
areas for ensuring security against quantum attacks are Quantum Cryptography and Post Quantum techniques, such as Lattice-Based
Cryptography, Code-Based Techniques, Hash-based and Multivariate-based techniques. One of the best techniques is Lattice-based
cryptography, which provides security against Quantum attacks through its unique, light weighted, and complex security properties
that can be used effectively to secure the Fog-cloud network. This paper deals with key generation and digital signature algorithms
based on Ring Learning with Error using Lattice-based schemes. The proposed Lattice-based Quantum Advanced Encryption Standard
method provides less time for encryption, decryption, and validation of signatures along with distinct keys. The maximum encryption
and decryption time for the message is 34.1 µsecond and 0.0280 second, respectively. The quantum bit required for the encryption and
decryption of text is between 10 to 21.