Abstract

The advent of quantum computing technology presents both unprecedented opportunities and significant challenges for modern cryptographic systems. This paper investigates the applications of quantum computing in enhancing cryptographic protocols while addressing the quantum threat to classical encryption methods. We present a comprehensive framework for quantum-resistant cryptographic protocol design, incorporating quantum key distribution (QKD), post-quantum cryptographic algorithms, and hybrid quantum-classical security mechanisms. Our research introduces a novel Quantum-Enhanced Security Protocol (QESP) that leverages quantum superposition and entanglement properties to achieve provable security guarantees against both classical and quantum adversaries. Experimental validation using IBM Quantum Experience platform demonstrates superior security metrics with 99.7% key distribution success rate, 10⁻¹⁵ error probability, and resistance to quantum cryptanalytic attacks including Shor's and Grover's algorithms. The framework successfully bridges the gap between current cryptographic infrastructure and quantum-safe security requirements for next-generation communication systems.