The rapid advancement of quantum computing threatens traditional cryptographic systems, such as RSA and ECC, which are vulnerable to algorithms such as Shor’s, posing risks to data security, including “Harvest Now, Decrypt Later” (HNDL) attacks. This paper proposes Quantum- Transport Layer Security (Q-TLS), an extension of TLS 1.3, integrating Elliptic Curve Cryptography (ECC)with the post-quantum Kyber algorithm to create a dual-layer hybrid encryption protocol. Local testing on a Windows 10 machine shows efficient performance, with handshake times ranging from 0.151 to 0.354 seconds and 1 MB message exchanges completed in approximately 0.04 to 0.06 seconds. Q-TLS ensures compatibility with existing TLS infrastructure while providing perfect forward secrecy and replay protection. Tailored for Bahrain’s government data security, it aligns with Vision 2030 goals for digital transformation and cybersecurity, offering a scalable, future-proof solution. This work advances post-quantum cryptography adoption and strengthens Bahrain’s position as a regional cybersecurity leader.
The rapid advancement of quantum computing threatens traditional cryptographic systems, such as RSA and ECC, which are vulnerable to algorithms such as Shor’s, posing risks to data security, including “Harvest Now, Decrypt Later” (HNDL) attacks. This paper proposes Quantum- Transport Layer Security (Q-TLS), an extension of TLS 1.3, integrating Elliptic Curve Cryptography (ECC)with the post-quantum Kyber algorithm to create a dual-layer hybrid encryption protocol. Local testing on a Windows 10 machine shows efficient performance, with handshake times ranging from 0.151 to 0.354 seconds and 1 MB message exchanges completed in approximately 0.04 to 0.06 seconds. Q-TLS ensures compatibility with existing TLS infrastructure while providing perfect forward secrecy and replay protection. Tailored for Bahrain’s government data security, it aligns with Vision 2030 goals for digital transformation and cybersecurity, offering a scalable, future-proof solution. This work advances post-quantum cryptography adoption and strengthens Bahrain’s position as a regional cybersecurity leader.
The rise of quantum computers threatens the security of current TLS protocols, which rely on elliptic curve and RSA-based primitives that quantum algorithms like Shor's can break. This creates a “store now, decrypt later” risk, where attackers may collect encrypted data today to decrypt it in the future once quantum capabilities advance. This study introduces a novel hybrid TLS protocol that seamlessly integrates classical (ECDSA and X25519) and post-quantum (CRYSTALS-Dilithium5 and CRYSTALS-Kyber1024) primitives. The proposed method generates a composite X. 509 certificate dual-signed with ECDSA and Dilithium5. It conducts a key exchange that concatenates an X25519 Diffie-Hellman shared secret with a Kyber KEM shared secret, followed by HKDF-SHA256 key derivation. The entire protocol is implemented in Go, leveraging the OQS liboqs-go library alongside Go's standard crypto packages. Experimental validation via a proof-of-concept demonstrates successful hybrid certificate validation and secure session establishment with both classical and post-quantum peers. These results confirm that hybrid cryptographic integration can provide quantum-resilient security while preserving compatibility with existing TLS deployments.
Abstract - In the emerging era of quantum computing, traditional cryptographic algorithms such as RSA and Elliptic Curve Cryptography (ECC) are at risk from quantum-based attacks. These developments pose a significant threat to secure network communication systems that rely on classical key exchange mechanisms. To overcome this challenge, the proposed work introduces a Hybrid Quantum-Resistant Key Exchange Protocol that combines the strengths of both classical andpost-quantum cryptographic algorithms. The hybrid approach integrates Elliptic Curve Dif ie–Hellman (ECDH) with alattice-based post-quantum algorithm, Kyber, to establish a shared session key between communicating entities. This sharedkeyisthen utilized for symmetric encryption using AES to ensure confidentiality and data integrity. The system is implementedusingPython socket programming to demonstrate secure data transmission between client and server. Performance is analyzedinterms of key generation time, encryption and decryption speed, key size, and computational ef iciency. The results validatethatthe proposed hybrid model provides enhanced resistance against quantum attacks while maintaining acceptable performance, making it suitable for future secure communication systems. Keywords - elliptic curve dif ie–hellman, hybrid key exchange, kyber, post-quantum cryptography, quantum computing.
The emergence of quantum computing presents a fundamental challenge to the security of current Internet communication systems. Transport Layer Security (TLS), which forms the backbone of secure web communication, predominantly relies on classical public-key cryptographic algorithms such as RSA and elliptic curve cryptography (ECC), both of which are susceptible to quantum attacks. This paper conducts a large scale empirical evaluation of post-quantum readiness across 32,011 domains, with a primary focus on real-world TLS deployments across diverse sectors by analysing negotiated TLS parameters, including protocol versions, cipher suites, key exchange mechanisms, and certificates. The results indicate that while modern protocols like TLS 1.3 and QUIC are gaining adoption, 15.70% of domains especially in critical sectors such as banking and government still rely on TLS 1.2. Furthermore, 49.3% of domains support hybrid post-quantum key exchange mechanisms (e.g., MLKEM768 with X25519), whereas 50.7% continue to use classical key exchange, reflecting partial transition. Notably, 0% adoption of hybrid post-quantum certificates was observed, leaving the authentication layer vulnerable to quantum-enabled attacks such as certificate forgery. The findings reveal uneven adoption of post-quantum mechanisms across sectors, where technology driven platforms are advancing more rapidly than legacy-dependent infrastructures. Overall, the study highlights that achieving complete quantum resilience requires a coordinated transition not only in key exchange mechanisms but also in certificate infrastructures. Without such comprehensive migration, Internet communication systems remain vulnerable to long-term threats, including Harvest-Now-Decrypt-Later (HNDL) attacks.
The digital age has ushered in a dependency on secure communication and data protection. Every day, vastamounts of sensitive information—ranging from personal data and financial transactions to governmentcommunications—are exchanged over networks. This security is largely ensured through modern cryptographicalgorithms that protect confidentiality, integrity, and authenticity. However, the emergence of quantumcomputing poses a significant threat to these systems, potentially rendering many classical cryptographictechniques obsolete. Quantum computers, leveraging the principles of quantum mechanics, have the theoreticalability to perform complex computations exponentially faster than classical computers. With the development ofquantum algorithms such as Shor’s algorithm and Grover’s algorithm, it becomes evident that once large-scalequantum computers become a reality, widely-used encryption schemes such as RSA, Elliptic CurveCryptography (ECC), and Diffie-Hellman may no longer be secure. Quantum-resistant cryptography, alsoknown as post-quantum cryptography, aims to develop cryptographic algorithms that are secure against bothclassical and quantum attacks. This project focuses on the study and analysis of quantum-resistant cryptographicalgorithms and presents the design, implementation, and evaluation of a Hybrid Post-Quantum TLS (PQ-TLS)framework. Experimental results demonstrate that the hybrid approach maintains efficient performance withsub-4-second response latencies and 100% data fidelity during encrypted transmission.
As quantum computing technology transitions from theoretical frameworks to scalable physical implementations, the "Harvest Now, Decrypt Later" (HNDL) strategy has emerged as a primary existential threat to long-term digital security. Adversaries are currently intercepting and archiving encrypted sensitive data with the intent of performing retroactive cryptanalysis once cryptographically relevant quantum computers (CRQC) become available. This paper addresses the vulnerability of current Public Key Infrastructure (PKI), specifically RSA and Elliptic Curve Cryptography (ECC), which are susceptible to Shor’s algorithm. We propose "Aethelgard," a high-performance hybrid cryptographic framework that nests NIST-standardized Post-Quantum Cryptography (PQC), specifically ML-KEM (Kyber), within established classical key exchange protocols. By utilizing a dual-layered Key Encapsulation Mechanism (KEM), our framework ensures that data remains confidential even if one of the underlying mathematical primitives is compromised. We evaluate the framework’s efficacy through rigorous network simulations, measuring computational overhead, handshake latency, and packet fragmentation across diverse traffic profiles. Experimental results indicate that while the hybrid approach increases the public key size to approximately 1.2 KB, the overall handshake latency increases by a manageable 18% compared to classical-only protocols. This research demonstrates that hybridizing cryptographic primitives is the most viable path toward achieving immediate "crypto-agility" and mitigating the silent threat of HNDL without sacrificing the reliability of current production environments.
The fast development of cyber communications, multimedia distribution, remote working have promoted the demand to transmit sensitive information through secure means in both the public and the private networks. The advent of massive quantum computers is rendering traditional cryptographic algorithms like RSA and Elliptic Curve Cryptography (ECC) insecure because they can crack the classical public-key algorithms like the Shor and Grover algorithms. This brings an immediate need of hybrid cryptographic systems, which integrate classical, quantum, and post-quantum algorithms to provide confidentiality, integrity, authentication, and future security beyond the quantum threat horizon.The paper is a proposal of a Hybrid Quantum-Post-Quantum Cryptographic Framework of transmitting files safely. It starts by aggregating files, which is a process to compress several files, images, videos, and multimedia files that users have chosen into one file to minimize redundancy and ease encryption. The AES-256 encrypted file is in GCM mode and provides confidentiality and integrity of the compressed file.The dual-layer mechanism ensures key establishment security. To begin with, Quantum Key Distribution (QKD) based on the protocols of BB84/E91 allows the Sender and the Receiver to generate a Quantum Secret Key (QSK) by exchanging quantum bits in quantum channel. Constant monitoring of the error rate facilitates automatic eavesdropping detection, and guarantees the keys generation is made when the conditions are secure, as well as the safeguarding of interception and man-in-the-middle attacks.A post-quantum layer is provided to ensure long-term security against quantum cryptanalysis, which uses Kyber, a NIST-approved lattice-based Key Encapsulation Mechanism (KEM). The Receiver creates a key pair of Kyber and disseminates the public key to the Sender. By using encapsulation, the Sender gets a PQC ciphertext and a Shared Secret (SS), with decapsulation on the Receiver side giving ensure that only participants of good faith get the same secret value.The hybridization phase consists of combining the QSK of QKD and SS of Kyber with the help of HKDF-SHA256 to obtain a Final Wrap Key (FWK). AES-GCM encrypts the key of file encryption by wrapping it with FWK which allows a secure and authenticated transfer of the key. The Sender sends four messages: encrypted file, Kyber ciphertext, wrapped AES key and the initialisation vector. At Receiver end, FWK is calculated once again with the help of QSK and SS so that the original data can be decrypted with the help of AES key.The suggested framework provides a defense-in-depth solution based on the combination of quantum security, post-quantum resilience and authenticated symmetric encryption. It can be analyzed that there is a strong resistance to classical and quantum adversaries, scalability, and compatibility with the existing communication networks. This renders the model to be appropriate to secure government communication, military systems, data exchange in healthcare environments, cloud storage and financial infrastructures. Keywords— Quantum Key Distribution (QKD), Post-Quantum Cryptography (PQC), Kyber,Key Encapsulation Mechanism (KEM), HKDF-SHA256, Quantum Secret Key (QSK), GCM Mode.