IT Baseline Protection Manual - The Information Warfare Site

Threats Catalogue Deliberate Acts Remarks
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T 5.33 Impersonation of wrong sender on fax
transmissions
Similar to writing letters using a false name and letterhead, it is possible to
send faked fax messages. This can cause damage if the recipient assumes that
the information is authentic and thus legally binding (c.f. T 3.14 Incorrect
assessment of the legal force of a fax).
Examples
- Signatures can be scanned in from other signed documents and printed out
onto the fax template or copied into the fax as a graphic file when the fax
server is used. On the fax received a signature reproduced in this way looks
no different from an authentic signature.
- The call number of the transmitting fax connection is generally sent during
the transmission. It is possible, however, to feign a different call number.
The reception logs should not therefore be viewed as a reliable proof of the
identity of the sender.
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IT-Baseline Protection Manual: Oktober 2000