31 Oct '14, 8pm

Reverse Engineering the D-Link WPS Pin Algorithm

A router with WPS requires a PIN to allow other devices to connect, and this PIN should be unique to every router and not derived from other easily accessible data found on the router. When [Craig] took a look at the firmware of a D-Link DIR-810L 802.11ac router, he found exactly the opposite ; the WPS PIN was easily decipherable because it was generated entirely from the router’s MAC address and could be reverse engineered by sniffing WiFi. When [Craig] was taking a look at the disassembled firmware from his router, he noticed a bit of code that accessed the NVRAM used for storing device-specific information like a serial number. This bit of code wasn’t retrieving a WPS pin, but the WAN MAC address instead. Instead of being unique to each device and opaque to every other bit of data on the router, the WPS pin was simply generated (with a bit of math) from the MAC address....

Full article: http://hackaday.com/2014/10/31/reverse-engineering-the-d-...

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