In light of the growing popularity of screen content video applications, there is a increasing demand for Screen Content Coding (SCC). The latest standard, Versatile Video Coding (VVC), exhibits exceptionally high coding efficiency, albeit accompanied by a considerable coding complexity. This complexity, in turn, restricts the widespread applicability of VVC SCC. To address this issue, this paper introduces a parallel based approach to enhance the coding speed of VVC SCC Intra Coding. Specifically, we established a large-scale database and then design distinct neural networks for Coding Units (CUs) of various sizes to predict candidate Coding Modes (CMs). Subsequently, we formulate a loss function based on CM distributions and Rate Distortion(RD) costs to train the designed models. Finally, we introduce a threshold selection scheme to balance coding efficiency and coding speed. Experimental results demonstrate that the proposed method improves coding speed by an average of 36.36%, with an average increase of 0.95% in Bjøntegaard Delta Bit Rate (BDBR).

Federated learning (FL) has been widely applied in Internet of Things (IoT). However, two security problems hinder the proliferation of FL in practical IoT, i.e., privacy leakage and poisoning attacks. To address these problems, various approaches have been proposed from different perspectives. Nevertheless, there remain two critical challenges: 1) how to establish a unified framework for protecting privacy and defending against poisoning attacks and 2) how to implement such methods in the flexible computing architecture of fog computing. In this article, we propose CROSSBEAM, a comprehensive scheme that provides both defense against poisoning attacks and privacy protection for FL in fog computing. Specifically, we construct frameworks to defend against poisoning attacks under both independent and identically distributed (IID) and non-IID settings. Meanwhile, we establish an actively secure framework to protect users’ privacy, building a bridge between privacy protection and poisoning defense. Our CROSSBEAM allows multiple fog nodes and users to collaboratively achieve the FL training. Besides, it can effectively alleviate the negative impact caused by poisoning attacks, meanwhile, users’ data confidentiality can still be guaranteed, even if multiple active fog nodes collude with each other to infer users’ privacy. Additionally, our scheme is of robustness to participants (fog nodes and users) being off-line during the training process. Moreover, benefited from the superiorities of our hierarchical mechanism and secure framework, our scheme can perform with high efficiency. We present rigorous security proof and extensive performance analysis for our CROSSBEAM.

The electromagnetic Trojan attack can break through the physical isolation to attack, and the leaked channel does not use the system network resources, which makes the traditional firewall and other intrusion detection devices unable to effectively prevent. Based on the existing research results, this paper proposes an electromagnetic Trojan detection method based on deep learning, which makes the work of electromagnetic Trojan analysis more intelligent. First, the electromagnetic wave signal is captured using software-defined radio technology, and then the signal is initially filtered in combination with a white list, a demodulated signal, and a rate of change in intensity. Secondly, the signal in the frequency domain is divided into blocks in a time-window mode, and the electromagnetic signals are represented by features such as time, information amount, and energy. Finally, the serialized signal feature vector is further extracted using the LSTM algorithm to identify the electromagnetic Trojan. This experiment uses the electromagnetic Trojan data published by Gurion University to test. And it can effectively defend electromagnetic Trojans, improve the participation of computers in electromagnetic Trojan detection, and reduce the cost of manual testing.