Quantum Randomness and Key Hashing in SSH Authentication Across Asymmetric Cryptographic Algorithms

In the ever-evolving field of cybersecurity, randomness plays a critical role in cryptographic systems. Traditional pseudo-random number generators, while widely used, can be vulnerable to attacks due to their deterministic nature. This paper explores the integration of quantum randomness into SSH authentication by utilizing a Quantum Random Number Generator (QRNG) to enhance key generation across various asymmetric cryptographic algorithms, specifically RSA, ECDSA, and EdDSA. Quantum-generated randomness offers a higher level of unpredictability, strengthening the security of cryptographic keys. We propose a method to generate keys using quantum random bits, hash them using SHA-256, and secure them for SSH authentication. The generated keys are evaluated for security improvements over conventional methods, and the performance of SSH authentication is analyzed. The results demonstrate that incorporating quantum randomness into key generation increases the cryptographic strength of the keys, offering a more robust defense against potential cryptanalytic attacks, while maintaining compatibility with existing SSH protocols. This approach signifies a step forward in leveraging quantum technologies to enhance network communication security.