The growing popularity of Internet of Things (IoT) devices raises significant challenges for secure key distribution in wide-area networks. Traditional solutions often face high deployment costs or distance limitations. This paper proposes a novel method that leverages the inherent reciprocity of Internet transmission delay to achieve lightweight symmetric keys distribution. The core of the method lies in the generation of reciprocal delay signals, and then in the enhancement of their randomness through randomized routing protocols and additional artificial delays. Moreover, an eavesdropping model is proposed to analyze single attackers, and a probabilistic framework is established to evaluate security limits against collusion attacks. Furthermore, error correction codes are implemented to allow the raw key to be directly used for encryption, eliminating additional communication overhead. Experimental results demonstrate a correlation coefficient of 0.97 for delay signals in a local area network (LAN), confirming strong reciprocity. On the public internet, the proposed randomness enhancement improves the entropy by 2 bits. Similarly, the correlation coefficient between signals obtained by an eavesdropper and the legitimate party in this wide-area environment ranges from 0.02 to 0.26, indicating that the method is resilient to eavesdropping. This work demonstrates the feasibility of utilizing public network characteristics for secure key distribution among wide-area terminals.

Abstract The novel network contains many sensors, which greatly heightens data transmission burdens. Some networks require the data perceived by sensors for a period to make decisions. Drawing inspiration from the human neural conduction mechanism, a waveform data encoding method called feature sensing neural coding (FSNC) is proposed to enhance network data transmission efficiency. It involves feature decomposition of information and subsequent non‐linear encoding of feature coefficients for data transmission. This approach exploits the unique neuronal responses to diverse stimuli and the inherent non‐linear characteristics of human neural coding. Finally, taking the speech signal and seismic wave signal as examples, the effectiveness of FSNC is verified by simulating the auditory nerve conduction process with frequency as a feature according to the mechanism of travelling wave motion of the basilar membrane in the cochlea. Moreover, experiments on seismic waveform signals have demonstrated the wide applicability of FSNC. Compared with traditional speech coding schemes, the FSNC bit rate is only 6.4 kbps, which greatly reduces the amount of data transmitted. Not only that, FSNC also has a certain fault tolerance, and parallel transmission can also greatly increase the transmission rate. This research provides new ideas for efficient data transmission over new networks.

Abstract There are a large number of perceptrons in the new bionic network. To improve the efficiency of data transmission in the bionic network, a maximum entropy neural coding method is proposed. By drawing on the characteristics of human nerve conduction, the authors designed a data transmission model and adopted an adaptive spike firing rate encoding strategy to maximize information entropy, thereby improving encoding efficiency. The simulation experiment results and the applications of the maximum entropy neural coding method to fault detection and seismic detection have validated the effectiveness of the maximum entropy neural coding method. Even if there is certain data distortion, the statistical characteristics of the decoded data and the fault detection performance will not be affected. This research not only proposes novel approaches for efficient data transmission in bionic network, but also identifies possible directions for enhancing data transmission efficiency through the integration of task‐oriented semantic communications in future applications.

The automatic topic labeling model aims at generating a sound, interpretable, and meaningful topic label that is used to interpret an LDA-style discovered topic, intending to reduce the cognitive load of end-users while browsing or investigating the topics. In this study, we first introduced the pre-trained language model BERT to topic labeling tasks. It exploits the contextual embedding of the pre-trained language model to improve the quality of encoding sentences. To generate a topic label with higher Relevance, Coverage, and Discrimination, we propose a novel summarization neural framework. Specifically, it exploits the paired-attention to model the relationship between the candidate sentences first and then decides which sentences should be included in the final summarization topic label. Moreover, we expected that high-quality sentence encoding representation could improve our model's performance. So, for each discovered topic, we trained a specific layer to extract the important topic-related features from the sentence embeddings as well as filter the noise information. The experimental results showed that our model significantly outperforms the state-of-the-art and classic topic labeling models.