Who reads your mails? With regular mails you, the receiver, all mail providers and maybe others can read them. With end-to-end encrypted mails only the sender and the receivers can read them. Our iOS-App Letterbox makes end-to-end encryption easy to use, is compatible with most mail providers and supports the standard encryption protocol OpenPGP.
Letterbox is simlar to common mail apps but indicates the security state of incoming and outgoing mails. We disinguish between a confidential and insecure mails.
Letterbox is a result of the research project enzevalos. The goal of the enzevalos project is to investigate means to render electronic mail encryption easy to use by most e-mail users. Letterbox was developted at the Freie Universität Berlin for research purposes and was studied in the lab.
We are grateful to the German Bundesministerium für Bildung und Forschung (BMBF) for funding this project. Projektpartner were Freie Universität Berlin, Technische Universität Berlin und die Wincor-Nixdorf International GmbH. Bitcoin Deutschland AG, Open-Xchange AG, Peering GmbH (ECIX) und Mynigma were associated project partners. The project started in January 2016 and ended in March 2018.