I have tried the application at https://apps.crp.to/.
It appears that the WEB browser interacts directly with the OnlyKey.
Therefore, I assume that the protocol used by the WEB browser to interact with the OnlyKey is a standard (since I don’t have to install any kind of add-on to use the OnlyKey from the WEB browser).
Could you give me the name of this protocol ? And if you have, could you give me a link to the protocol description ? (an RFC, I suppose)
I ask you this question because I’d like to develop an (open source) application for crypt / decrypt / sign using the OnlyKey (not right now, though).