Most decent garage door openers use "rolling codes" these days. For example, Genie's "Intellicode"[0]: > The Intellicode Access Security System provides state-

Most decent garage door openers use "rolling codes" these days. For example, Genie's "Intellicode"[0]: > The Intellicode Access Security System provides state-of-the-art security for your home by automatically changing your opener’s access code every time you push the remote control button. This prevents an unauthorized person from stealing the access code to your opener system and gaining entry to your garage. A quick Google turned up OpenSesame[1] which says this about "rolling codes": > These are not foolproof from attack, but do prevent the OpenSesame attack along with traditional brute forcing attacks. Suggested vendors: current products from LiftMaster and Genie. [0] http://www.geniecompany.com/garage-door-openers/retail_std-features.aspx http://www.geniecompany.com/garage-door-openers/retail_std-f... [1] http://samy.pl/opensesame/ http://samy.pl/opensesame/