| 摘要 |
Systems, methods, and apparatus for securely encrypting electronic mail (e-mail) are presented. In some examples, a system for sending encrypted electronic messages includes a client computer configured to compose an electronic text message and define at least one recipient address. The computer is in contact with a mail server that is configured to take an electronic text message, at least one recipient address, and, optionally, a file attachment, and format such into an e-mail including an e-mail header. Both user and recipient are provided with unique Numerical Ids that are sent to a public key distribution server that is configured to receive the Numerical Ids and return a public key specific to the recipient for encrypting the e-mail.
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