MEGA: Malleable Encryption Goes Awry
This speaks volumes about the need of standardized encrypted cloud storage protocols.It always surprises me how fragmented the entire space is: 
Syncthing "untrusted devices" support is still experimental, Nextcloud does support encryption, but it's hard to judge how trustworthy it is. Gocryptfs and ecryptfs should be solid, but they are hard to use in a browser or on mobile. Resilio, Borg, Tarsnap, EteSync -- yet more protocols, and without clear security analyses.Same holds for commercial cloud operators: support for client-side encryption is starting to appear (Google Drive), but without an open, standardized client you still need to trust software from the cloud provider, which mostly defies the point of encrypting in the first place.