Delta Green agents are highly enouraged to investigate this communications protocol and make use of it.
Conventional cryptography uses a single key to encrypt and decrypt.
This means that if an unfriendly third party obtains the key, all information encrypted with it is vulnerable. When you use a public-key system like the free software Pretty Good Privacy, you generate a key pair , composed of a public key and a private key . You keep the private key private, not distributing it to anyone else. But the public key can be published far and wide. There is a network of key servers on the Internet, which collect and index public keys, allowing you to make your own key readily availabe and to retrieve the public keys of others.