This paper presents a Grid infrastructure that is being developed at the Space Research Institute NASU NSAU, and integrates the resources of several geographically distributed organizations. The use of Grid technologies is motivated by the need to make computa tions in the near real time for fast response to natural disasters and to manage large volumes of satellite data. We use the Grid infra structure for a number of applications that heavily rely on Earth observation data. The applications include: weather prediction, flood monitoring, biodiversity assessment, crop yield prediction, and Earth land parameters estimation.

The existing solutions for counteracting and preventing the interception of data and tokens of two-factor authentication are considered. Features that may indicate the presence of a silent reverse proxy server are chosen. It is proposed to analyze the information about additional time anomalies, which are usually created by the proxy server. The advantage of this approach is that the time characteristics information is generated on the client-side, and the malicious proxy server cannot modify it. Machine learning methods were used to detect implicit signs of the presence of a proxy server. A new method of detecting a silent reverse proxy server that satisfies the following conditions is proposed: 1) the human factor is minimized, 2) use by an individual user is possible, 3) the method has an acceptable impact on performance and can be used in real-time.

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