Abstract
tandard communication channels based on radio waves may not be considered safe. Signals that user receives may come from different places, which may be hidden. User is not able to determine the source of the signals. This may be used by illegitimate users to spoof or to sniff wireless channel. In order to authenticate the sender’s wireless device one has to use additional out-of-band channel. The paper is a survey of out-of-band authentication methods and systems. Standards, theoretical works as well as commercial solutions have been presented.
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