Falcon is an efficient and secure postquantum signature scheme for services based on quantum computing. It employs the hash-and-sign approach in conjunction with the Gentry, Peikert, and Vaikuntanathan (GPV) framework on Number Theory Research Unit (NTRU) lattices. This study evaluated the operation procedure and the capacity to run the Falcon scheme using a key length of 1024 bits on different hardware and software platforms, such as personal computers and Raspberry Pi 4 and Windows, Ubuntu, and Android operating systems. The following results were obtained: file sizes ranged from 30 to 5449268 KB, digital signature times ranged from 50 to 19500ms, and signature verification times ranged from 14 to 19000ms. The results show that the Falcon post-quantum signature scheme works stably and ensures execution speed on different platforms, similar to current digital signature schemes.

In this paper, a technique to develop a secure messaging service utilizing a new post-quantum cryptosystem, termed CryptoMess, is proposed. Commutative Supersingular Isogeny Diffie-Hellman (CSIDH) is utilized to secure key exchange paired with the AES algorithm to protect message content in communication. At the same time, the Rainbow post-quantum digital signature technology is incorporated to assure the integrity and authenticity of communications between the sender and the recipient. As a consequence, the messaging program is able to exchange messages between users, assuring safety, security, integrity, and authenticity. The performance of the program has a transmitting rate of approximately 0.26 s and a receiving rate of approximately 0.22 s. The message signing time is approximately 0.027 s, the message verification speed is approximately 0.22 s, and the key exchange time is approximately 0.0017s.

In this study, the authors propose a solution for implementing a digital signature system using the post-quantum digital signature scheme Falcon on the FPGA hardware platform XC7A35T-CPG236. The system is combined with a software component developed in C# using the NET Framework 4.7, capable of running on the Windows operating system. Falcon is selected for its compact signature size and high computational performance, optimizing the signing and verification processes on hardware. The system is designed to leverage the hardware acceleration capabilities of an FPGA to enhance performance compared to software-only signature methods. The integration of the Falcon scheme into both hardware (FPGA) and software components ensures high flexibility for real-world deployment. The obtained results show that key generation execution time is approximately 1516.2 ms, while the signing and verification times are around 2–5 ms. Hardware resource usage has significantly improved, and the power consumption is 0.097 W (57%). However, the software component has not yet undergone thorough security testing. Given the achieved results in terms of execution time and energy consumption, the proposed device and software may be suitable for certain applications that do not require stringent performance and energy constraints. Furthermore, this research demonstrates the feasibility of deploying post-quantum cryptographic solutions on embedded hardware platforms, contributing to the development of secure communication systems in the future.

Amid the escalating concerns over internet security, quantum cryptography stands out as a highly promising solution for significantly enhancing the security of networking systems, emerging among them is the quantum key distribution (QKD) with the function of creating secret session keys a breeze when leveraging the intriguing properties of quantum mechanics. This study is rooted in the BB84 QKD method, where in the distribution process in the quantum realm is simulated to derive a shared key via a public channel connecting two clients with the assistance of a server, utilizing the quantum inspire (QI) platform to generate qubits within the BB84 protocol. The results, the findings regarding the performance of BB84 reveal that when the server is set up, and the key size increases to 4000 bits, the process of sending module takes 16.215 sec, the transfer module takes approximately 5.2 hours, the receive module takes 1.257 sec to finish the process for the final session key share. This indicates a noteworthy enhancement in the execution speed of QKD employing the BB84 protocol, which now holds the potential for reinforcing network security using quantum computing systems.