You can and should encrypt your individual email messages during transit, but both you and your recipient must do some work ahead of time to make the protection work properly. You can use encryption features built into your email service, or you can download encryption software or client add-ons (such as those that use OpenPGP). In a pinch, you can use a Web-based encryption email service like Sendinc or JumbleMe, though doing so forces you to trust a third-party company.
Most forms of message encryption, including S/MIME (Secure/Multipurpose Internet Mail Extensions) and OpenPGP, require you to install a security certificate on your computer and to give your contacts a string of characters called your public key before they can send you an encrypted message. Likewise, the intended recipients of your encrypted message must install a security certificate on their computer and give you their public key in advance.
Support for the S/MIME standard is built into many email clients, including Microsoft Outlook. In addition, Web browser add-ons, like Gmail S/MIME for Firefox, support Web-based email providers as well. To get started, you can apply for a security certificate from a company such as Comodo.
The OpenPGP (Pretty Good Privacy) email encryption standard has a few variants, including PGP and GNU Privacy Guard (GnuPG). You can find free and commercial software and add-ons, such asGpg4win or PGP Desktop Email, that support the OpenPGP type of encryption.a
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