Impressioning is the art of fabricating a working key for a lock using only a hand file, a blank key, and keen observation. Without taking any mechanisms apart, and while only accessing a locked door from its secured side, it is possible to manipulate a lock in such a way that it will “leak” information, allowing for a full decoding of the pins within. This attack sometimes takes longer than conventional lockpicking, but it is very effective and if successful it will result in total compromise of the lock not just one time… but for all time. This presentation will demonstrate the art of impressioning, and attendees will be able to try these attacks themselves afterward in our hands-on area. LanguageEnglish While paying the bills as a security auditor and penetration testing consultant with his company, The CORE Group, Deviant Ollam is also member of the Board of Directors of the US division of TOOOL, The Open Organisation Of Lockpickers. Every year at DEFCON and ShmooCon Deviant runs the Lockpicking Village, and he has conducted physical security training sessions for Black Hat, DeepSec, ToorCon, HackCon, ShakaCon, HackInTheBox, ekoparty, AusCERT, GovCERT, CONFidence, the FBI, the NSA, DARPA, and the United States Military Academy at West Point. His favorite Amendments to the US Constitution are, in no particular order, the 1st, 2nd, 9th, & 10th.