Covert timing channels convey information by modulating some aspect of system behavior over time, so that the program receiving the information can observe system behavior and infer protected information.
Whenever possible, specify implementation strategies that do not introduce time variances in operations.
Often one can artificially manipulate the time which operations take or -- when operations occur -- can remove information from the attacker.
It is reasonable to add artificial or random delays so that the amount of CPU time consumed is independent of the action being taken by the application.
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