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Well number three if a bad guy has unrestricted physical access to your computer it's not your computer

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anymore.

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When this principle was created it was 100 percent true.

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During one of the pre-vis modules we've learned that if someone is able to run his own operating system

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on a computer he can change the administrator password of the computer.

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You can also remove his hard drive and make a copy of it.

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Nothing can stop him from doing that.

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At present the situation is different things to software that enables you to encrypt whole hard drives

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system partitions included

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full encryptions prevent unauthorized people from reading and modifying hard drive contents even if

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they have physical access to the hard drive.

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If the encryption mechanism was well designed every modification attempt would be a blind guess.

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Even so we can state that the third law is still valid.

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To encrypt data you need a key the same key is needed for decryption uses for automatic encryption.

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The most

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they also prefer not to type long strings of symbols every time they start the system in the case of

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automatic encryption the decryption key is saved and the system from person gets physical access to

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a computer.

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They also get access to the key having the key.

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There would easily decrypt and read the data.

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The third law is still largely valid despite modern solutions were discussed the exception is when the

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decryption key isn't stored on the computer or the storage is secured.

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The T.P. and most computers are suited with nowadays.

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Gives you this possibility.

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We will elaborate on that more in one of the next modules.