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When preparing to perform an access control review for telecommunications, the major area of focus is:
Maintenance of access logs of usage of various system resources.
Accountability system and the functionality to identify any terminal accessing system resources.
Adequate protection of stored data on systems by encryption or other means.
Authorization and authentication of the user prior to granting access to system resources.
The authorization and authentication of users is the most significant aspect in a telecommunications access control review, as it is a preventive control. Weak controls at this level can affect all other aspects. The maintenance of access logs of usage of system resources is a detective control. The adequate protection of data being transmitted to and from servers by encryption or other means is a method of protecting information during transmission and is not an access issue. The accountability system and the ability to identify any terminal accessing system resources deal with controlling access through the identification of a terminal.
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