The key, also called a cipher, must be of sufficient length so it cannot be guessed through computer algorithms. A 128-bit key is considered sufficiently long today. The U.S. government forbids the export of any product containing 128-bit encryption keys. PKI, or public key infrastructure, is the function of handing out public and private encryption keys. A certificate authority is an organization that will issue, track, and revoke encryption keys, usually in the form of digital certificates, for users.
Encryption is built into many security products today.
Its product is very popular for encrypting email. Perhaps if you're not a math expert, encryption does seem a little magical, but so does the rest of technology. Sandi Smith, CPA, has helped people use technology effectively for 20 years. She conducts workshops, speaks at conferences, consults with business owners, and has authored three books and numerous articles on a variety of technology topics.