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How to Digitally sign and encrypt your email messages

Certificate information form with fields for personal details and security options.

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.

Apple's iOS 26 and iPadOS 26 updates are packed with new features, and you can try them before almost everyone else. First, check our list of supported iPhone and iPad models, then follow our step-by-step guide to install the iOS/iPadOS 26 beta — no paid developer account required.