Several devices
You can mark on the computer and then record on the phone. To do this, you have to give the second device access to your Nextcloud and the encryption key. This is what Pair another device does, on the home page.
How to pair
- On a phone: scan the QR code shown.
- On another computer: copy the link and send it to yourself, then type the code separately.
The link works once, within 10 minutes. Half of its secret is a random number that the relay keeps for 10 minutes at most and gives only once, to the device that opens the link: after that, the link and its code open nothing, for anybody. A mistyped code can be typed again; past 10 minutes, or if the link was already used, make a new one. If the link says it was already used when you did not use it, someone else did: change the key and the app password (below).
What the link contains
The link and the code open everything
Never pass on the code together with the link. The code is not written anywhere: you have to read it on the screen. The link alone is not enough, but do not leave it lying around.
The link is never sent to a server, and it leaves the address bar as soon as the page opens.
What syncs, and what does not
| Data | Does it pass from one device to the other? |
|---|---|
| Class lists and assignments | Yes, through the encrypted backup |
| Links between students and memos | Yes, through the encrypted backup |
| Memos sent | Yes, they are in Nextcloud |
| Recordings not yet sent | No, they stay on the device that made them |
So send your drafts before switching devices.
When another device has changed your data, a message says so within a minute while the tool is open, and offers to Fetch it: nothing changes on the screen without your say. Your recordings not sent yet stay as they are. To fetch at once, click ⟳ next to "Saved in your Nextcloud, encrypted", at the bottom of the screen.
If two devices work at the same time
Nothing is overwritten: when two versions cross, they are merged. For the same student, the most recent memo is the one kept.
A personal or a shared device
When you sign in, or pair a device, Corico asks what this device is.
| Personal | Shared, as in the staff room | |
|---|---|---|
| Access, key, lists | Kept in the browser | In the page's memory only |
| Recordings not sent yet | Kept in the browser | In the page's memory only |
| Closing or reloading the page | Nothing to do again | Everything is forgotten: sign in and pair again |
| 30 minutes without activity | Nothing, or locked by a local password | Everything is forgotten, unless recordings are not sent |
On a shared device, the browser asks before you leave the page, and a new version waits for your next sign-in. Send your recordings before you go: after 30 minutes without activity, a band reminds you. The quickest way in on a shared computer is to pair it from your phone: the link brings the access and the key at once.
Never a shared device alone
The key is then forgotten when the page closes. If no other device is paired with your account, everything done there is lost: assignments, class lists, links between students and memos. Corico keeps no list of your devices: it warns you each time.
The choice can be changed later in the menu ☰, This device.
On a shared computer, never Personal
Whoever uses the browser after you would open Corico, and your whole Nextcloud: the app password gives access to all your files in it, not only to Corico's.
A local password
On a personal device that others can use, a family computer for instance, the menu ☰, This device, lets you choose a local password, of 8 characters at least. It is then asked when Corico opens, and after 30 minutes without activity; Lock now asks for it at once.
What Corico keeps on the device (the access, the key, the lists, the recordings not sent yet) is then sealed by it: whoever opens the browser, or copies its files, reads nothing without it. It never leaves the device, and nobody can recover it. Forgotten, it opens nothing: Forgot the password? erases this device's data; sign in again, then pair it from another device to get your lists back. Recordings not sent yet from this device are lost. If no other device is paired with your account, everything is lost for good: nobody can read your backup without the key, not even you.
Choose a phrase rather than a word: nothing can count the tries made on a copy of the device, each one is only slowed down on purpose.
Revoke a device's access
A device lost, or left open on a shared computer: in your ENT's Nextcloud, Settings, then Security; under Devices & sessions, find corico, open its menu ⋯ and click Revoke. Corico then opens nothing more in your Nextcloud, from any device: they all share this app password. Create a new one, as in the first steps, and paste it on each of your devices when Corico asks for it.
Erasing or losing a device
Erase this device's data: this button removes from this browser the access, the lists, the drafts, the key and the local password. Your memos stay in Nextcloud. If no other device is paired with your account, the rest is lost for good: Corico warns you before.
A lost or stolen device: on the home page, A device lost or stolen guides you. Delete the app password in Nextcloud, which all your devices share, and create a new one. Then change the key: your backup is encrypted again with a key the lost device does not have, and a pairing link already made becomes useless. Pair your other devices again: what they hold is merged.
What the lost device already holds can still be read by whoever opens it, and the links of the memos do not change. If that is a worry, delete the assignments concerned: the QR codes then stop working.
The key exists only on your devices
If the key disappears everywhere, the backup can no longer be read. Nobody can recover it for you. You then have to start from scratch: your memos and the QR codes already stuck keep working, but the lists and the links between students and memos are lost. Keeping a second paired device protects you from this.