|Scenario Tool Description=A browser add-on for using public key encryption with your webmail. It uses the OpenPGP standard for encrypting and signing email messages. It operates as an overlay to your Gmail Yahoo or any other web accessible email client.   Website: https://www.mailvelope.com/ OS: Windows, MacOS, Linux Requirements: Firefox, Chrome UI language: English, Chinese (+ 27 ongoing translations) License: GNU Affero General Public License