SpeedPass Is Cracked!

Graduate students at Johns Hopkins working with Avi Rubin, and Ari Juels and Michael Szydlo at RSA Laboratories, have posted an extended analysis of the Texas Instruments DST RFID used in both Mobil SpeedPass and in a variety of automotive anti-theft systems.

Apparently, the Digital Signature Transponder (DST) was based on a 40-bit cryptographic key and a 24-bit response. The website is a bit light on the "special-purpose cryptographic technique used to reconstruct the algorithm used in the DST tags," but apparently the overall system works.