Freenigma: Encryption for webmail
Until now, security-conscious email users could employ encryption with traditional email clients, but were out of luck with webmail services. Freenigma, a service to add encryption to third-party webmail services via a Firefox plugin, aims to add security to the convenience of webmail. My trial of the service indicates that it's making a good start, but has room to improve.
Freenigma provides encryption that works across multiple webmail platforms. It isn't the first system to encrypt webmail, but it is the first that I'm aware of that encrypts mail for third-party services such as Gmail.
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