Just another example of a proprietary implementation tweaking a de-facto standard / well-known algorithm (RFC 6238) just enough to be annoying. Fresh in my min

Just another example of a proprietary implementation tweaking a de-facto standard / well-known algorithm (RFC 6238) just enough to be annoying. Fresh in my mind is the Wii U controller reverse-engineering presented at 30C3, where the WPA-PSK handshake protocol was tweaked by performing bit-rotations on the resulting keys.