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| | Fred Cohen 'Computer Security Encyclopedia. Computer Viruses.' (VX heavens) (Site not responding. Last check: 2007-11-07) |
 | | In most of these systems, the user with the lowest security clearance is the greatest threat from the standpoint of viral attack, because higher security level users can run programs written at the lowest security level, and thus become infected [1,13]. |
 | | Some simple examples of covert channels are the amount of disk space, the time to complete a task, printing delay, etc. In the most secure current systems, there are hundreds of covert channels with bandwidths in the range of 50 bits/sec each. |
 | | Thus when brought to the attention of the security officer, the user would login in front of the officer and everything would appear correct. |
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