CamyCal — the shared calendar that stores only ciphertext

Field notes

CamyCal converts a user’s passphrase into a device-held key and stores calendar records as ciphertext, with the page illustrating server fields such as iv, ct, and version. Events can use shared custom fields including invoice numbers, checklists, ratings, and access codes, then appear through an iPhone Calendar subscription feed. That feed is intentionally treated as a bearer credential: the page warns that anyone with the link can read it and provides a revoke action.