The only people who should read your emails are you and your intended recipients. Protect your privacy with this simple crytography guide, which shows how to obtain a free certificate for signing and encrypting email messages, how to download and install the certificate on Mac OS X 10.5, and how to use the newly installed certificate in Apple Mail.
The first part of this tutorial applies to all operating systems for obtaining a PKI certificate, installation for other email clients or other operating systems will be slightly different. For a complete, step-by-step instructions, and to get started encrypting your own digital corespondence, watch this free video tutorial.
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