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In the previous sections, we learned a number of methods to send and receive data privately and anonymously.

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This data can be simple text or it can be files such as an image, a PDF, a document, and so on.

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All of these methods used end to end encryption.

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So if the data gets intercepted by any entity, the data will be useless to this entity because it will

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be simply gibberish and it will only be decrypted once it's received by the person that we want them

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to receive it.

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This is all great, but first of all, we have to trust that these methods of communication are implementing

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the encryption properly, that there are no problems or no flaws in the way that they're encrypting

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and decrypting the data.

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And what if we wanted to send data through a website or through a form of communication that does not

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support encryption?

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In this case, you'll have to manually encrypt your data, and the person that receives the data have

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to manually decrypted.

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Because this is very important.

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I decided to make a full section on encryption in this course.

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So in this section, first of all, we're going to learn about asymmetric and symmetric encryption.

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You're going to learn how it works and why we prefer to use end to end encryption.

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Then I'm going to teach you how to manually encrypt your data again, whether it's text or files such

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as a PDF or a document or a song.

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You'll also learn how to decrypt this data once you receive it.

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You'll learn how to sign this data.

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So when a person receives this data, they can confirm that it was actually sent by you and not by someone

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else.

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And you'll also learn how to verify the signatures and integrity of the files and of data that you receive

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so that you know that this wasn't played with as it was sent to you, it wasn't tampered with.

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And to make sure that it was actually sent from the sender and not someone else.

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So you can use this as another layer of encryption on top of the other methods.

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So even if you're using a method that supports encryption, you can manually encrypt and decrypt the

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data just to make sure that your files or your data is as private as possible.

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And you can use this, like I said, to send files and to send data using unsecure methods of communication,

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even using normal post.

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And you'll know if this data gets intercepted, it's still secure and it's still private because whoever

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intercepts it will not be able to read it because it will be encrypted and it will be gibberish.