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The access control mechanism for all systems, application and networks must validate the log-on information only on completion of all input data. If an error condition arises, the system should not indicate which part of the data is correct or incorrect.

Where possible systems must provide a notification message or banner to individuals before granting access to the system and shall include pertinent information regarding computer misuse, privacy information and any applicable legal requirements.
The access control mechanism for all systems, application and networks must not provide help messages during the log-on procedure that would aid an unauthorised user.