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All E2ee related user settings are found in the Security section of their Personal Settings.

Key Storage

When more than one Key Storage was provided by the administrator, all ownCloud users must select their preferred storage first. This step is neither needed nor available when there is provided only a single storage.

 

Depending on the system settings you can choose how you want the decryption to be performed. This depends on your security requirements and possibilities:

 DescriptionUsability
Local StorageThe private key is stored in the browser local storage (similar to a cookie)(star)(star)(star)
Key ServerThe private key is available through an external process running on the client machine. Then the browser can only request decryption.
You have to install an extra Key Server on your machine, which is able to both recognize provided key files or Smart Cards (currently Windows only).
The key is never saved in the browser.
(star)(star)
AskWhen downloading an E2EE file, the private key has to be copy/pasted into a browser form. The key is never saved in the browser.(star)
Download onlyThe E2EE file is downloaded locally and a secondary tool is required to decrypt (E2EE Reader).
The E2EE Reader supports both file and Smart Card decryption (currently Windows only).
The key is never saved in the browser.
(star)/(star)(star)

Private Key Generation

For the Local Storage key storage, ownCloud users must generate their own private key.

 

After generation you should copy or download the private key to a secure location. A backup of the private key is strongly recommended. In case the system crashes or a user is deleted by accident you cannot read the shared files anymore. The private key is NEVER sent to the server. The private key can never be recovered.

A user can have multiple private keys assigned to his account i.e. for multiple devices. Files uploaded into one os his encrpyted folders will automatically be encrypted for ALL his private keys.

 

Once the private key is generated the public key is uploaded on the fly. From then on, a user can create encrypted folders.

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