1
00:00:00,720 --> 00:00:08,370
In the previous sections we learned a number of methods to send and receive data privately and anonymously.

2
00:00:08,370 --> 00:00:15,240
This data can be simple text or it can be files such as an image a PDA f a document and so on.

3
00:00:16,340 --> 00:00:23,210
All of these methods used end to end encryption so if the data gets intercepted by any entity the data

4
00:00:23,210 --> 00:00:29,510
will be useless to this entity because it'll be simply gibberish and it'll only be decrypted once it's

5
00:00:29,510 --> 00:00:33,080
received by the person that we want them to receive it.

6
00:00:33,080 --> 00:00:40,340
This is all great but first of all we have to trust that these methods of communication are implementing

7
00:00:40,370 --> 00:00:45,500
the encryption properly that there are no problems or no flaws in the way that they're encrypting and

8
00:00:45,500 --> 00:00:46,700
decrypting the data.

9
00:00:47,420 --> 00:00:54,050
And what if we wanted to send data through a website or through a form of communication that does not

10
00:00:54,050 --> 00:00:56,330
support encryption.

11
00:00:56,330 --> 00:01:02,300
In this case you'll have to manually encrypt your data and the person that receives the data have to

12
00:01:02,300 --> 00:01:06,340
manually decrypted because this is very important.

13
00:01:06,350 --> 00:01:13,830
I decided to make a full section on encryption in this course so in the section first of all we're going

14
00:01:13,830 --> 00:01:17,170
to learn about asymmetric and symmetric encryption.

15
00:01:17,170 --> 00:01:21,920
You're going to learn how it works and why we prefer to use end to end encryption.

16
00:01:21,970 --> 00:01:27,760
Then I'm going to teach you how to manually encrypt your data again whether it's text or file such as

17
00:01:27,760 --> 00:01:30,310
a PDA or a document or a song.

18
00:01:30,310 --> 00:01:33,670
You'll also learn how to decrypt this data once you receive it.

19
00:01:33,670 --> 00:01:35,730
You'll learn how to sign this data.

20
00:01:35,770 --> 00:01:42,880
So when a person receives this data they can confirm that it was actually sent by you and not by someone

21
00:01:42,880 --> 00:01:49,720
else and you'll also learn how to verify the signatures and integrity of the files and of data that

22
00:01:49,720 --> 00:01:56,140
you receive so that you know that this wasn't played with us it was sent to you it wasn't tampered with

23
00:01:56,350 --> 00:02:02,470
and to make sure that it was actually sent from the sender and not someone else.

24
00:02:02,470 --> 00:02:07,340
So you can use this as another layer of encryption on top of the other methods.

25
00:02:07,360 --> 00:02:12,460
So even if you're using a method that supports encryption you can manually encrypt and decrypt the data

26
00:02:12,520 --> 00:02:19,570
just to make sure that your files or your data is as private as possible and you can use this like I

27
00:02:19,570 --> 00:02:26,890
said to send files and to send data using unsecured methods of communication even use a normal post

28
00:02:27,220 --> 00:02:33,040
and you'll know if this data gets intercepted It's still secure and is still private because whoever

29
00:02:33,040 --> 00:02:38,340
intercepts it will not be able to read it because it will be encrypted and it will be gibberish.