Share with Care: Breaking E2EE in Nextcloud

ePrint Report: Share with Care: Breaking E2EE in Nextcloud

Martin R. Albrecht, Matilda Backendal, Daniele Coppola, Kenneth G. Paterson

Nextcloud is a leading cloud storage platform with more than 20 million users.
Nextcloud offers an end-to-end encryption (E2EE) feature that is claimed to be able “to keep extremely sensitive data fully secure even in case of a full server breach”.
They also claim that the Nextcloud server “has Zero Knowledge, that is, never has access to any of the data …

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