7.4. Using Public Key Infrastructure
The Public Key Infrastructure (PKI) is a first attempt to provide all the aspects of security to messages and transactions that have been previously discussed. The need for universal systems to support e-commerce, secure transactions, and information privacy is one aspect of the issues being addressed with PKI.
PKI is a two-key—asymmetric—system with four key components: Certificate Authority (CA), Registration Authority (RA), RSA, and digital certificates. Messages are encrypted with a public key and decrypted with a private key. As an example, take the following scenario:
You want to send an encrypted message to Jordan, so you request his public key.
Jordan responds by sending you that key.
You use the public ...