1
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Well Number seven encrypted data is only as secure as its decryption key.

2
00:00:09,530 --> 00:00:12,560
This principle is as obvious as it is overlooked.

3
00:00:15,070 --> 00:00:20,320
Some people encrypt data or passwords using a specialised program which requires a password to start

4
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the encryption process and then they store the decryption password on the same computer.

5
00:00:28,060 --> 00:00:31,160
This does not hinder the attack in any way.

6
00:00:31,210 --> 00:00:34,880
You have to protect the decryption key.

7
00:00:34,980 --> 00:00:39,420
The strength of encryption measures comes from the fact that it allows you to focus on protection of

8
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a relatively small element the key rather than the whole body of data.

9
00:00:45,460 --> 00:00:49,960
Similarly if you keep your car keys safe you don't have to worry about someone driving off with your

10
00:00:49,960 --> 00:00:50,650
car.

11
00:00:52,710 --> 00:00:57,870
But if you lock the car door and leave the keys on the car roof it would hardly protect the car from

12
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being stolen.

13
00:01:00,150 --> 00:01:04,160
This is a perfect metaphor for encryption measures.

14
00:01:04,280 --> 00:01:06,440
The Second Law is still valid.