Pretty Good Privacy (PGP) is an encryption system used for both sending encrypted emails and encrypting sensitive files. Since its invention back in 1991, PGP has become the de facto standard for email security.

The popularity of PGP is based on two factors. The first is that the system was originally available as freeware, and so spread rapidly among users who wanted an extra level of security for their email messages. The second is that since PGP uses both symmetric encryption and public-key encryption, it allows users who have never met to send encrypted messages to each other without exchanging private encryption keys.

Run the standard setup guide, which will auto-install the software on your Mac, and then open GPG Keychain. Your first task is to create a new key, which will be used to sign and decrypt all.

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If you want to improve the security of your email messages, PGP offers a relatively easy and cost-effective way to do this. In this guide, we’ll show you how.

How Does PGP Encryption Work?

PGP shares some features with other encryption systems you may have heard of, like Kerberos encryption (which is used to authenticate network users) and SSL encryption (which is used to secure websites).

At a basic level, PGP encryption uses a combination of two forms of encryption: symmetric key encryption, and public-key encryption.

In order to understand how PGP works, it’s useful to look at a diagram:

The mathematics behind encryption can get pretty complex (though you can take a look at the math if you like), so here we’ll stick to the basic concepts. At the highest level, this is how PGP encryption works:

First, PGP generates a random session key using one of two (main) algorithms. This key is a huge number that cannot be guessed, and is only used once.
Next, this session key is encrypted. This is done using the public key of the intended recipient of the message. The public key is tied to a particular person’s identity, and anyone can use it to send them a message.
The sender sends their encrypted PGP session key to the recipient, and they are able to decrypt it using their private key. Using this session key, the recipient is now able to decrypt the actual message.

This might seem like a strange way to do things. Why would we encrypt the encryption key itself?

Well, the answer is pretty simple. Public key cryptography is much, much slower than symmetric encryption (where both the sender and recipient have the same key). Using symmetric encryption requires, though, that a sender share the encryption key with the recipient in plain text, and this would be insecure. So by encrypting the symmetric key using the (asymmetric) public-key system, PGP combines the efficiency of symmetric encryption with the security of public-key cryptography.

Example of PGP Encryption in Action

In practice, sending a message encrypted with PGP is simpler than the above explanation makes it sound. Let’s take a look at ProtonMail – as an example.

ProtonMail natively supports PGP, and all you have to do to encrypt your email is to select Sign Mail. You will see a padlock icon on the subject line of their emails. The email will look like this (the email addresses have been blurred for privacy reasons):

ProtonMail – like most email clients that offer PGP – hides all of the complexity of the encryption and decryption of the message. If you are communicating to users outside of ProtonMail, you need to send them your public key first.

Stellar activation key. And so, although the message was sent securely, the recipient does not have to worry about the complexities of how this was done.

PGP Encryption Uses

There are, essentially, three main uses of PGP:

Sending and receiving encrypted emails.
Verifying the identity of the person who has sent you this message.
Encrypting files stored on your devices or in the cloud.

Of these three uses, the first – sending secure email – is by far the dominant application of PGP. But let’s take a brief look at all three

Encrypting Emails

As in the example above, most people use PGP to send encrypted emails. In the early years of PGP, it was mainly used by activists, journalists, and other people who deal with sensitive information. Glass heart princess psp english patch. The PGP system was originally designed, in fact, by a peace and political activist named Paul Zimmerman, who recently joined Startpage, one of the most popular private search engines.

Today, the popularity of PGP has grown significantly. As more users have realized just how much information corporations and their governments are collecting on them, huge numbers of people now use the standard to keep their private information private.

Digital Signature Verification

A related use of PGP is that it can be used for email verification. If a journalist is unsure about the identity of a person sending them a message, for instance, they can use a Digital Signature alongside PGP to verify this.

Digital signatures work by using an algorithm to combine the sender’s key with the data they are sending. This generates a “hash function,” another algorithm that can convert a message to a block of data of fixed size. This is then encrypted using the sender’s private key.

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The recipient of the message can then decrypt this data using the sender’s public key. If even one character of the message has been changed in transit, the recipient will know. This can indicate either the sender is not who they say they are, that they have tried to fake a Digital Signature, or that the message has been tampered with.

Encrypting Files

A third use of PGP is to encrypt files. Because the algorithm used by PGP – normally the RSA algorithm – is essentially unbreakable, PGP offers a highly secure way of encrypting files at rest, especially when used alongside a Threat Detection and Response Solution. In fact, this algorithm is so secure that it has even been used in high-profile malware such as the CryptoLocker malware.

Back in 2010, Symantec acquired PGP Corp., which held the rights for the PGP system. Since then, Symantec has become the dominant vendor of PGP file-encryption software through such products as Symantec Encryption Desktop and Symantec Encryption Desktop Storage. This software offers PGP encryption for all your files, whilst also hiding the complexities of encryption and decryption processes.

Do I Need Pretty Good Privacy Encryption?

Whether you need to use PGP encryption will depend on how secure you want your communications (or files) to be. As with any privacy or security software, using PGP req