WEBVTT

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Hello guys and welcome!

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We’ll start talking about GNU Privacy Guard or GPG.


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GnuPG is a cryptographic tool that helps you manage public and private keys as well as perform encryption

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and decryption, both symmetric and asymmetric signing and verifying operations.

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In my opinion GPG is the most popular cryptographic tool and offers the highest level of security.

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If you want to encrypt a file and to be sure that no one will ever access it, GPG is your tool of

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choice.

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Of course this is debatable!

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Note that gpg is not a cryptographic protocol but it implements the same cryptographic protocol as

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everyone uses.

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You’ll find sha-2  hash algorithms family, aes used for symmetric encryption or

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rsa used for public key encryption; it's somehow similar to Open SSL just that its main purpose

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is a little bit different.

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GnuPG is an open source implementation of OpenPGP ( Pretty Good 


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Privacy ) standard as defined in RFC 4880. 

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Let's start with the installation! Depending on your platform, 


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you can install the GPG command line tool with the following commands. On macOS the easiest installation

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is to use the popular package manager Homebrew.
In a terminal you just type brew install gnupg;
on Windows

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you can find the GnuPG installer at this address: https://gpg4win.org/download.html In this example I'm gonna use Linux.

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Most Linux distributions like Ubuntu, Linux Mint, Kali Linux and so on 

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come with gpg already installed. But if it's necessary you can install it by executing sudo apt


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install gnupg

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On Kali Linux GNUPG is already the newest version; to get started and to make sure it is installed

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correctly run gpg --help

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It printed out the version number, supported encryption and hash algorithms and all the usage options.

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You see, it's a very complex command. This will give you an overview of all the features of GPG! OK

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I'll take a short break and in the next lectures we'll see how to encrypt a file using both symmetric

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and asymmetric encryption.