For example, with PGP you could establish that all outgoing and incoming encrypted messages are first copied to a special archive, and that all outgoing messages are encrypted with a special administrator's key that can be used in an emergency to read the message if the sender forgets his key or leaves the company. When Dan Backman of Network Computing magazine tested five different products, he found several that couldn't read messages sent by others. This debate is more about politics than technology, because the U.S. government places restrictions on various algorithms, as mentioned earlier. Netscape software supports key lengths ranging from 512 to 1024 bits, for example. RSA, Inc., developed RC2.
Debate abounds as to which is the better or more or less proprietary technology.
These details are outside the scope of this article, but you should know that the larger the key size and encryption algorithm, the more difficult it is for someone to decode an intercepted message. Your next choice is to consider whether to just make use of a digital signature, to encrypt the entire message, or to make use of both technologies. All encryption products can do both, but in somewhat different ways. Digital signatures guarantee that your recipients have received your message without any tampering and that they can trust that the message came from you. The actual message body, and any attachments, arrive without any encryption, meaning that someone could still capture this traffic and read your correspondence.