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Bluetooth, by default, uses an encrypted communications algorithm so get a Bluetooth USB adapter and then a Bluetooth keyboard.
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If you wish to go really high tech there is the Celluon Magic Cube Laser Projection Virtual Keyboard <br />
Description:<br />
the magic cube is an ultra-portable and versatile product that is a <b>projection keyboard </b>and a multi-touch capable mouse,<br />
all in one easy to use product.<br />
The keyboard is projected onto the surface as you type away.<br />
Come in featured colors<br />
<a href="https://uae.souq.com/ae-en/celluon-magic-cube-laser-projection-virtual-keyboard-bluetooth-usb-5647100/i/" rel="ugc">https://uae.souq.com/ae-en/celluon-magic-cube-laser-projection-virtual-keyboard-bluetooth-usb-5647100/i/</a><br />
<a href="http://www.techeblog.com/index.php/tech-gadget/celluon-epic-laser-projection-keyboard-gets-42-reduction-to-99-shipped-today-only" rel="ugc">http://www.techeblog.com/index.php/tech-gadget/celluon-epic-laser-projection-keyboard-gets-42-reduction-to-99-shipped-today-only</a><br />
<a href="https://www.ebay.com/b/Bluetooth-Laser-Keyboards/33963/bn_348193" rel="ugc">https://www.ebay.com/b/Bluetooth-Laser-Keyboards/33963/bn_348193</a>
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I did not like the other recommendations.
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I'm looking for an extremely quiet wireless keyboard for our client conference room that also needs to have the wireless connection encrypted. &nbsp;I've tried the Logitech MK520 but apparently it's too loud. &nbsp;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? &nbsp;<br />
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I don't think management would like a laser projected keyboard either.<br />
<br />
Thanks,<br />
<br />
Dave
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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

Looking for a quiet encrypted wireless keyboard

keyboard

A personal computer is a general-purpose computer whose size, capabilities and price make it useful for individuals, and is intended to be operated directly by an end-user with no intervening computer time-sharing models that allowed systems to be used by many people, usually at the same time. Personal computers may be connected to a local area network (LAN), either by a cable or a wireless connection, and through that to the Internet. A personal computer may be a laptop computer or a desktop computer running an operating system such as Windows, Linux or Macintosh OS.

A desktop computer is a personal computer designed for use at a single location due to its size and power requirements, usually by one person. The most common configuration has a case that houses the power supply, motherboard, disk storage (usually one or more hard disk drives and optical disc drives); a keyboard and mouse for input; and computer monitor and printer for output. The case may be oriented horizontally and placed atop a desk or vertically and placed underneath or beside a desk.