Samy Kamkar has built a new device that can intercept the codes used to unlock most cars and many garage doors. The device can be hidden underneath a vehicle and when the owner approaches and hits the unlock button, the device grabs the unique code sent by the remote and stores it for later use. Kamkar said that the device works on most vehicles and garage doors that use rolling, rather than fixed, codes. Device is built from about $30 in hardware and will be revealed at DEF CON here Friday.
Source: https://threatpost.com/gone-in-less-than-a-second/114154/