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Some time I want to give access to my computer for my Guests. How can I create a disposable password to my user account so that they have no access to my account in the future, without my permission. The password should be deleted immediately or at logout/shutdown.

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There is one-time passwords authentication. However, Guest Session can be more secure solution and it available out of the box.

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Sound nice. Have a look. – totti Feb 26 '13 at 4:31

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