Quantum key distribution (QKD) is an encrypted communication technique based on the principles of quantum mechanics that ensures communication security by exploiting the properties of quantum states. Currently, the transmission efficiency of the QKD system is low. Trusted relay technology is used to solve this problem and achieve long-distance transmission. However, trusted relaying alone cannot decrypt the issues of poor link stability and the low utilization of key resources. To further optimize the system performance, we propose a dynamic routing algorithm. One of the improvement schemes includes the following: firstly, an adjustable-size quantum key pool (QKP) is designed, which can dynamically adjust the size of the refreshing pool according to the actual demand. Secondly, the utilization of key resources is improved by using the residual quantum key model to dynamically obtain the remaining key amount in the QKP and set the key amount threshold. We calculate the link-blocking probability and track the blocking intensity and blocking entry by combining the Poisson process, thus realizing the evaluation of the link stability. Finally, the number of remaining keys in the QKP and the link-blocking probability combine with the random wandering model as the basis of the route selection for the QKD dynamic routing algorithm to achieve efficient key path selection. We validated the algorithm by comparing it with other algorithms on the Mininet simulation platform, and the algorithm proved to have a better performance in terms of congestion avoidance, delay reduction, and improved QKD efficiency. This scheme provides a novel and efficient way to solve the problems in existing QKD systems. It effectively improves the transmission efficiency and strengthens the system’s security by dynamically obtaining the critical volume, accurately evaluating the link state, and selecting the optimal critical path.

The recent years has witnessed rapid development of social network platforms. To enable timely and effective selection of information that is valuable and raises interests, a variety of personalized recommendation algorithms have been put into practice. The improved clustering based on the Isolation Point (ICIP) algorithm is presented based on clustering. In order to overcome the shortcomings of the traditional clustering, the process of Isolation Point has been included in the ICIP algorithm. In this paper, the ICIP algorithm is used for topic extraction of WeChat articles. According to the characteristics of the social network platform, the data noise reduction and modeling is adopted first and then text classification is achieved based on the similarity. The ICIP is applied to remove isolated points, improve clustering accuracy and reduce noise. Compared with other clustering algorithms, the ICIP algorithm has higher accuracy and efficiency.

As a cutting-edge quantum communication technology, quantum key distribution(QKD) is based on the basic principles of quantum mechanics, which guarantees its unconditional security in theory. Any attempt to eavesdrop will leave traces. However, in practical applications, there are also security issues such as attackers disguising themselves as legitimate users to establish contact with both parties in communication, intercepting quantum key distribution information, or possibly obtaining keys by eavesdropping or tampering with information in classical channels. In order to solve the above problems, this paper proposes a solution of introducing Chaum-Pedersen zero-knowledge proof and Gottesman-Chuang quantum signature in QKD. Before key distribution, the Chaum-Pedersen zero-knowledge proof is used to effectively verify the identities of both parties in communication, solve the problem of disguising as legitimate communication parties, and improve the security and credibility of communication. The Gottesman-Chuang quantum signature provides an unforgeable signature for messages or data in QKD, effectively preventing information from being tampered with or forged during transmission, and further strengthening the security of communication. This paper proves through simulation experiments of BB84 and E91 protocols that the security of enhanced QKD has been significantly improved by adding zero-knowledge proof and quantum signature. The key generation rate of enhanced BB84 has increased by 29.68\%, and that of enhanced E91 has increased by 28.26\%. The overall security performance has been significantly improved. Our solution has high superiority and feasibility.

To ensure the security of information exchange in software-defined optical networks, quantum key distribution (QKD) based on quantum mechanics is introduced. However, the slow and valuable process of generating quantum key resources contradicts the high-speed data transmission requirements of optical networks. To address this issue, this paper proposes the CPSR-HQKDN scheme, which takes into account factors such as security requests, key demand, key residual, and key update rates for trusted and untrusted links. This approach improves resource utilization and service efficiency by optimizing the processing order of key requests. Moreover, the routing strategy dynamically adjusts based on the network resource environment, thereby increasing the success rate of key requests. Through simulation experiments comparing the performance of the CPSR-HQKDN routing scheme with existing schemes, it is observed that in high-concurrent scenarios, the CPSR-HQKDN routing scheme can improve the success rate of key requests by at least 5%.