The CA makes its own public key readily available through print publicity or perhaps on the Internet. The recipient of an encrypted message uses the CA's public key to decode the digital certificate attached to the message, verifies it as issued by the CA and then obtains the sender's public key and identification information held within the certificate. With this information, the recipient can send an encrypted reply. The technology is standards based. To ensure complete security it's not just the data that needs protecting but also the other information, such as headers and routing information, that is included in e-mails.
ASPs work with all sizes of organizations.
When using an ASP, businesses need not be expert in all the various parts of the security puzzle, presumably, the ASP will have the expertise to protect your information. Most security problems don't take place across the Internet. Most of them take place at the platform level, inside an organization. Encryption alone, won't protect from intruders on the company server, he said. Reducing Costs and Risks ASPs provide applications to customers on a subscription basis, including necessary support services.