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Hi all :),
During past months I worked on idea [0]. Currently it's supported only by 
Firefox and Chrome. The repo is at [1] and the qubes-issue regarding 
contribution message is at [2]. It was assigned to the 4.1 milestone.

I've a question about if is acceptable (in term of performance, specifically 
latency) to have some form of signed USB input, from a usbvm. A lot of laptop 
(the majority?) has only an USB controller and without reset capabilities. The 
most susceptible device, IMHO, is USB keyboard. So if it's possible to put a 
proxy USB signer device (e.g. a rPi Zero) between the USB keyboard and the 
usbvm, Dom0 could verify that input come from the signer device.
However thanks the Qubes 4.0 flexibility this necessity could be suppressed by 
"Qubes Air". Unfortunately I cannot try Qubes 4.0-rcX. I hope that the 4.0-rc4 
hasn't any major problem. So it became the stable release, <3.


[0] = https://www.qubes-os.org/gsoc/#thunderbird-firefox-and-chrome-extensions
[1] = https://github.com/raffaeleflorio/qubes-url-redirector
[2] = https://github.com/QubesOS/qubes-issues/issues/3152

Best Regards,
Raffaele.
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