Between the time the screen saver is started and the time the computer is actually locked, there is a grace period.(Pg 74, Mac OS X Security Configuration for version 10.4 or later, second edition, Second Edition) A hot corner should be set up to quickly start the screensaver when the mouse is moved into that corner of the screen. This will decrease the amount of time an unattended computer can be viewed by unauthorized users. A short inactive time period should be used to activate the screensaver.(ยง 3.6.15, Australian Government ICT Security Manual (ACSI 33)) Systems should be configured to lock sessions after a maximum of 15 minutes of inactivity.(Control: 0428 Bullet 2, Australian Government Information Security Manual: Controls) The organization must configure the session lock or screen lock to activate after 10 minutes of inactivity or when the user activates it, for top secret systems.(Control: 0427 Bullet 2, Australian Government Information Security Manual: Controls) The organization should configure the session lock or screen lock to activate after 15 minutes of inactivity or when the user activates it, for systems classified below top secret.
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