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Statistical anomaly detection techniques provide the next layer of cyber-security defences below traditional signature-based approaches. This article presents a scalable, principled, probability-based technique for detecting outlying connectivity behaviour within a directed interaction network such as a computer network. Independent Bayesian statistical models are fit to each message recipient in...
The possibility for theft or misuse of legitimate user credentials is a potential cyber-security weakness in any enterprise computer network which is almost impossible to eradicate. However, by monitoring the network traffic patterns, it can be possible to detect misuse of credentials. This article presents an initial investigation into deconvolving the mixture behaviour of several individuals within...
Computer networks are complex and the analysis of their structure in search for anomalous behaviour is both a challenging and important task for cyber security. For instance, new edges, i.e. connections from a host or user to a computer that has not been connected to before, provide potentially strong statistical evidence for detecting anomalies. Unusual new edges can sometimes be indicative of both...
Modern enterprise computer networks rely on centrally managed authentication schemes that allow users to easily communicate access credentials to many computer systems and applications. The authentication events typically consist of a user connecting to a computer with an authorized credential. These credentials are often cached on the application servers which creates a risk that they may be stolen...
With the rapid development of computer networks, network security has become a hot topic of concern to people, not just a simple network security threat network needs normal people, but also the pursuit of networking technology in innovative source of power. To address this issue, this article on network security solution to the problem definition and further discussion, and propose how to establish...
Access to computer networks and systems is most often based on the use of conventional passwords nowadays. However, users have difficulty remembering a password that is long and random-appearing. So, they create short, simple, and insecure passwords. Graphical passwords have been designed to try to make passwords more memorable and easier for people to use, to create and, therefore, more usable and...
An electronic voting system makes it possible for the voters to cast their ballots over the computer network. Hence, voters can participate in elections without having to go to the polling places, which is more convenient and efficient. To design a practical voting scheme, Mu and Varadharajan proposed an anonymous secure electronic voting scheme to be applied over the network in 1998. However, Linet...
Because DDoS attacks destination servers from computers distributed all over network, it is very hard to locate attacking sources and resist DDoS. In this paper, a new defending mechanism based on registration and authentication against DDoS is proposed. By bidirectional warning messages, it can help locate attacking sources quickly and resist DDoS more exactly. According to the mechanism, all servers...
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