PGP is a popular method for encrypting data. It is a standard for encrypting emails and other data. There are many different implementations of PGP, but the most popular is OpenPGP. Popular tools for PGP are gpg, gpg2, and gpg-agent.
Installing OpenPGP on a Mac
brew install gnupg
Creating a Key
First, you need to create a key. This is done by running the following command:
This actually creates a pair of keys, one for encryption and one for signing. The first key is called the private key, and the second is called the public key. You should always keep the private key safe. The public key is what you share with others.
With the pubic key, anyone can encrypt data that only you can decrypt - using the private key. To share the public key you can export it to a file.
Exporting the Public Key
To export the public key, run the following command:
gpg --armor --export <email> > public_key.asc
Importing the Public Key
To encrypt data, you need to import the public key. This is done by running the following command:
gpg --import public_key.asc
List public keys
To list the public keys, run the following command:
List secret keys
Encrypting a File
To encrypt a file, run the following command:
gpg --encrypt --armor --recipient <email> <file>
Decrypting a File
To decrypt a file, run the following command:
gpg --decrypt <file>
Another tool that is useful for PGP is bcwipe. This tool is a command line utility that can be used to wipe a block device. It is useful for wiping a hard drive before installing a new operating system.
To install bcwipe, run the following command:
brew install bcwipe