In our talk at 30C3, we report our findings exploring a particular microcontroller brand, namely, Appotech and its AX211 and AX215 offerings. We discover a simple “knock” sequence transmitted over manufacturer-reserved commands (namely, CMD63 followed by ‘A’,'P’,'P’,'O’) that drop the controller into a firmware loading mode. At this point, the card will accept the next 512 bytes and run it as code. ....

Once you allow the government to start breaking the law, no matter how seemingly justifiable the reason, you relinquish the contract between you and the government which establishes that the government works for and obeys you, the citizen—the employer—the master. And once the government starts operating outside the law, answerable to no one but itself, there’s no way to rein it back in, short of revolution. -- John W. Whitehead

Zwangsbejagung Ade!