IT Baseline Protection Manual - The Information Warfare Site

Safeguard Catalogue - Communications Remarks
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Data transmission should be properly controlled in all organisations. All data
transmission facilities should be approved and their use should be subject to
clear rules (see also S 2.n2 Prevention of insecure network access).
In order that no security loopholes are created through data transmission over
GSM interfaces, these should be subject to restrictions. For example, no
mobile phone cards should be permitted on IT systems on which sensitive data
is handled. This applies also to all IT systems which are connected to a
computer network, to ensure that it is not possible for the firewall protection to
be undermined.
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IT-Baseline Protection Manual: Oktober 2000
Control of data
transmission