Proton Calendar, which claims to be the “world’s only” calendar using end-to-end encryption and cryptographic verification, has arrived on iOS, giving those seeking a more secure work suite an alternative to Google, Apple, and the like.
Proton Calendar is pitched as offering encryption for all event details, as well as “high-performance elliptic curve cryptography (ECC Curve25519)” to lock it. The web app version of Proton Calendar is open source, with the code for mobile apps to come next, Proton says. Proton also notes that it never finds out who you’ve invited to an event, and it allows for inviting people outside the Proton ecosystem, letting people “cryptographically verify that it was you who invited them.”
Andy Yen, CEO of Proton, said in an interview with Wired in May that calendars are an “extremely sensitive” record of your life and that protecting them is essential. Encryption protects your calendar data from government requests, data leaks, or “a change in business model of your cloud provider.”
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