In this era of technological change, metaverse has attracted extensive attention from all over the world as next-generation internet. Blockchain technology plays an indispensable role in realizing the independent digital identity and economic system which are the significant attributes of the metaverse. To achieve the cross-universe mechanism and reduce network resource consumption, this paper proposes a cross-chain protocol for the underlying architecture of metaverse that utilizes an identity information chain to guarantee the separate digital identity of users and decrease the data interaction between varied consortium blockchains. However, along with the rapid development of quantum computing, the classical cryptosystems which commonly count on mathematical complexity will not be reliable and secure. The current post-quantum cryptography technologies that increase the time complexity of algorithm will lead to quite low efficiency and high resource overhead while applying to blockchain structures. But quantum cryptography is capable of lifting both security and efficiency of blockchain. As a result, the scheme put forward in the article adopts quantum teleportation to implement secure communication. In addition, to assure the atomicity of cross-chain transactions that cross-chain asset exchanges succeed or fail simultaneously, a quantum time lock that improves the previous studies and combines quantum cryptography technology is proposed.
In this era of technological change, metaverse has attracted extensive attention from all over the world as next-generation internet. Blockchain technology plays an indispensable role in realizing the independent digital identity and economic system which are the significant attributes of the metaverse. To achieve the cross-universe mechanism and reduce network resource consumption, this paper proposes a cross-chain protocol for the underlying architecture of metaverse that utilizes an identity information chain to guarantee the separate digital identity of users and decrease the data interaction between varied consortium blockchains. However, along with the rapid development of quantum computing, the classical cryptosystems which commonly count on mathematical complexity will not be reliable and secure. The current post-quantum cryptography technologies that increase the time complexity of algorithm will lead to quite low efficiency and high resource overhead while applying to blockchain structures. But quantum cryptography is capable of lifting both security and efficiency of blockchain. As a result, the scheme put forward in the article adopts quantum teleportation to implement secure communication. In addition, to assure the atomicity of cross-chain transactions that cross-chain asset exchanges succeed or fail simultaneously, a quantum time lock that improves the previous studies and combines quantum cryptography technology is proposed.
Blockchain systems are fundamentally dependent on classical cryptographic primitives, which are increasingly threatened by the rapid advancement of quantum computing. In cross-chain communication and interoperability protocols, where safe asset transfer and validation across heterogeneous networks are crucial, this danger is especially serious. Ensuring quantum-resilient interoperability is crucial for preserving security, trust, and long-term sustainability as next-generation blockchain ecosystems move toward multi-chain architectures. Relays, bridges, and atomic swaps are examples of existing interoperability methods that mostly rely on public-key cryptography, which is susceptible to quantum assaults like Shor's algorithm. In the post-quantum era, this vulnerability puts digital assets and cross-chain transactions at risk of compromise. This paper suggests a quantum-resilient cross-chain interoperability protocol framework to overcome this difficulty and allow safe and effective communication between various blockchain platforms. The suggested design incorporates post-quantum cryptographic techniques, such as hash-based and lattice-based signature algorithms, with consensus bridging and cross-chain transaction validation procedures. Additionally, a hybrid cryptographic transition model is presented to provide a progressive transition towards quantum-safe primitives while guaranteeing backward compatibility with current classical systems. The proposed structure greatly increases resilience against quantum attackers while maintaining interoperability efficiency, according to experimental evaluation. Robustness against replay attacks, signature forging, and key compromise under quantum threat models is confirmed by security analysis. The suggested protocol ensures strong and quantum-resilient interoperability in next-generation blockchain infrastructures by offering a scalable and future-ready foundation for safe multi-chain ecosystems.
The metaverse has profoundly altered the conventional online landscape and has attracted significant interest from researchers and industry professionals. As the metaverse changes quickly, it needs strong and safe cryptographic solutions to make sure that transactions are fair and safe in its highly connected world. This paper presents a novel blockchain-assisted fair exchange signature protocol leveraging quantum key distribution (QKD) to ensure security against both classical and quantum adversaries. The suggested protocol combines blockchain technology with quantum key distribution to create an exchange framework that can’t be changed, is clear, and can’t be tampered with. It also uses quantum mechanics to create keys that are always safe. By incorporating a fair exchange mechanism, the protocol guarantees that either both parties fulfill their obligations or neither party benefits, addressing trust issues in decentralized metaverse transactions. Furthermore, we provide a detailed analysis of the protocol’s security, efficiency, and scalability, highlighting its resistance to quantum attacks and its suitability for real-time applications in the metaverse. Simulation results demonstrate that the protocol significantly enhances exchange fairness, minimizes latency, and ensures robust authentication, making it a promising candidate for securing transactions in next-generation digital ecosystems. Web 3.0 technologies provide a resolution by facilitating a decentralized metaverse ecology. The suggested protocol utilizes quantum fundamentals to facilitate safe communication, while the incorporation of quantum cryptography with Web 3.0 improves the efficiency, security, and authenticity of metaverse environments. We test the proposed quantum signature scheme both theoretically and practically using QuantumSim simulations, demonstrating strong signature performance in comparison to other schemes. The results indicate a computational cost of0.815ms, and communication costs of 1312 bits, demonstrating the protocol’s resilience and performance by conducting a thorough safety and efficiency analysis and demonstrating compliance with essential security features, including unforgeability, undeniability, verifiability, and traceability.
The Metaverse integrates virtual reality, augmented reality, and decentralized economies, but its security foundations are increasingly threatened by quantum computing. Classical cryptography used in blockchain systems is vulnerable to quantum attacks, while existing blockchain-based frameworks lack quantum resistance. Quantum Key Distribution (QKD) offers provably secure communication, but has not been systematically applied to Metaverse security. To address this gap, we propose Q-CryptChain, a hybrid framework that combines QKD with blockchain to deliver quantum-safe confidentiality, tamper-proof integrity, and continuous authentication. We formalize the system and threat model, define explicit security properties, and present strengthened algorithms for handshake, transaction validation, and session monitoring. Q-CryptChain provides a future-proof security foundation for Metaverse ecosystems, enabling trustworthy interactions against emerging quantum-era threats.
Quantum computing's development poses a significant threat to the cryptographic security of current blockchain technologies, potentially undermining the integrity of digital transactions. Quantum computers can break the complex mathematical problems that algorithms like RSA and ECC rely on, which could lead to vulnerabilities such as double-spending and fraud. To address these risks, the blockchain community is exploring quantum-resistant protocols that employ post-quantum cryptographic algorithms, which are designed to withstand quantum computing attacks. Quantum-secure blockchain protocols integrate quantum key distribution (QKD) and post-quantum cryptography (PQC) to enhance security. QKD uses quantum mechanics principles to secure communication channels, ensuring that any attempt to intercept the key introduces detectable anomalies. PQC involves algorithms like lattice-based, hash-based, or multivariate polynomial-based algorithms that are believed to be secure against quantum attacks. These protocols aim to maintain the confidentiality, integrity, and security of data transmitted over the blockchain, ensuring the longevity and reliability of blockchain systems in the face of evolving computational advancements. A quantum-secure blockchain scheme (QSB) utilizes a consensus mechanism, QPoA, and IQS. The QPoA is leveraged for block generation while the IQS is deployed in transaction verification1. Furthermore, the integration of quantum computing with blockchain can address current limitations, such as slow transaction speeds and lack of scalability, by optimizing calculations and enabling smarter, more sophisticated smart contracts. The development and implementation of quantum-resistant blockchains are essential for future-proofing digital transactions and maintaining trust in decentralized systems
With such rapid development occurring in quantum computing, it becomes a great threat to the security of the Metaverse. Quantum computers are emerging machines that, when scaled up to the necessary strengths, pose a serious risk of cracking the current security codes and protocols used in the digital world. This chapter will discuss the emergence of quantum computing as a threat to Metaverse security and ways to approach its threat in the future. We will start by exploring the threat of quantitative computing on Metaverse security and the capability of quantum algorithms such as Shor’s algorithm to efficiently decipher RSA and elliptic curve cryptography. We will also cover the timelines for quantum supremacy and the urgent necessity to migrate to post-quantum cryptography. In the next section, we will explore the ongoing initiatives the governments and standards bodies are taking to counter this threat. This will include covering current activities such as the U.S. National Quantum Initiative Act, National Institute of Standards and Technology’s (NIST) process of post-quantum cryptography standardization, and the EU’s Quantum Flagship program. The chapter will focus on the need for global cooperation and collaboration to fend off quantum attacks on the Metaverse. We will then examine the factors that affect the security of the Metaverse, a networked environment primarily based on virtual reality, augmented reality, and real-time. We will consider the importance of developing new low-latency quantum-resistant cryptography for Metaverse communication and using quantum key distribution for secure infrastructure in the Metaverse. It will also analyze the use of artificial intelligence and machine learning in improving Metaverse security. The subsequent sections of this chapter will explore how artificial intelligence (AI) can identify anomalous activities, determine threats, and protect itself from attacks in real time. However, we will also be reminded of the potential risks of AI and the usefulness of human intervention and supervision. Constantly evolving quantum computing poses a significant threat to the Metaverse, its providers, and users, as we will see in this chapter. This will involve the directions given toward the migration out of quantum cryptography, proactive adoption of defense-in-depth techniques, and quantum-safe assets. We will also talk about the concept of user training and the necessity of identity and access management in the Metaverse.
Abstract To counter the threats posed by quantum computing attacks on blockchain systems, researchers have explored both post-quantum blockchain and quantum blockchain solutions. However, post-quantum blockchain typically relies on complex mathematical puzzles, which result in high computational complexity and, consequently, low operational efficiency. Conversely, quantum blockchain is entirely dependent on the quantum processing capabilities of its nodes, leading to significant consumption of quantum resources, high networking costs, and reduced practicality. To address these challenges, a blockchain framework based on a semi-quantum key distribution network, referred to as Semi-Quantum Blockchain (SQB), is proposed. SQB enables classical users to engage in transactions while ensuring the unconditional security provided by quantum cryptography, significantly reducing the costs associated with network formation. The security analysis demonstrates that SQB provides robust post-quantum security and significantly outperforms its peers in terms of quantum resource consumption and quantum communication efficiency, establishing it as a secure and efficient blockchain solution.