Looking for a quiet encrypted wireless keyboard

I'm looking for an extremely quiet wireless keyboard for our client conference room that also needs to have the wireless connection encrypted.  I've tried the Logitech MK520 but apparently it's too loud.  We originally had the HP Wireless Elite v2 Desktop which was quiet enough but the wireless wasn't encrypted and the keyboard would lose connection to the PC at times (only 10 ft away from the PC). Any suggestions?  

I don't think management would like a laser projected keyboard either.

Thanks,

Dave
npdodgeAsked:
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npdodgeAuthor Commented:
Thanks, I went with the Logitech K800.
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Davis McCarnOwnerCommented:
Bluetooth, by default, uses an encrypted communications algorithm so get a Bluetooth USB adapter and then a Bluetooth keyboard.
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MereteCommented:
If you wish to go really high tech there is the Celluon Magic Cube Laser Projection Virtual Keyboard
Description:
the magic cube is an ultra-portable and versatile product that is a projection keyboard and a multi-touch capable mouse,
all in one easy to use product.
The keyboard is projected onto the surface as you type away.
Come in featured colors
https://uae.souq.com/ae-en/celluon-magic-cube-laser-projection-virtual-keyboard-bluetooth-usb-5647100/i/
http://www.techeblog.com/index.php/tech-gadget/celluon-epic-laser-projection-keyboard-gets-42-reduction-to-99-shipped-today-only
https://www.ebay.com/b/Bluetooth-Laser-Keyboards/33963/bn_348193
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npdodgeAuthor Commented:
I did not like the other recommendations.
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