I'd like to find a small linux box with the following specifications:

• Small (mini-ITX size is OK)
• Fanless
• Runs Debian
• At least two gigabit network interfaces
• WLAN that supports "host ap" with hostapd + mac80211 in AP mode
• Can encrypt AES at least 10 megabytes per second
• Total cost $300 or less

Solutions from multiple parts also accepted - I can buy an external network card etc. and build the box myself if the components are available. If you don't know about the "host ap" thing, just suggest your solution, I'll find out if I can get that resolved.

If I can't get all that, I can possibly skip the "runs Debian" part, and I can definitely skip the hostapd part if the box can be a wireless access point with multiple ESSIDs out of the box.

Something like Asus RT-N16 is close - doesn't run Debian easily, and probably doesn't encrypt AES fast enough. Something like Zotac ZBOX HD-ID11 is also close - no idea which WLAN card it has and it lacks second gigabit interface, but otherwise nice.