Compromising radiation

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Under compromising radiation (also compromising emission , rare compromising emanations ) refers to (usually electromagnetic ) emissions of technical equipment that allows conclusions to be processed in the equipment data.

A distinction must be made between compromising radiation and electromagnetic compatibility , which is merely about the mutual influence of devices by electromagnetic fields. The limit values ​​for electromagnetic compatibility are usually not sufficient to prevent compromising radiation.

In order to be able to draw conclusions about the processed data from the emission of devices, special receiving devices are required, since the compromising emission is usually weak. However, using suitable measurement setups (at comparatively low costs), data such as the content of a computer screen can be analyzed up to a distance of over 100 m. The technique used for this is Van Eck phreaking .

The radiation can also take place acoustically. Appropriate irradiation of a device can only cause compromising radiation.

The analysis of compromising emissions is mainly used by intelligence and intelligence services.


  1. heise online: The little eavesdropping on encryption , news from May 12, 2004.

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