Liftmaster/Chamberlain/Sentex 893Max Remote Control Transmitter. I've tested this method on following security systems. In this instructable i'll explain how to analyse passive entry system codes and how to repeat the codes to gain access. Currently I'm working on these types of systems, hopefully will be able to do a instructable on these as well. Most common method is Rolling code which dynamically change codes based on common algorithm on both key and receiver. There are several ways these systems implemented. On other hand active entry systems are much harder to hack. Main reason this method still popular is that it's not practical to brute force and break these codes (2^24 combinations to brute force with 24 bit code). Even with this major vulnerability, these type of security systems are still widely used. Therefore it's just a matter of capture the signal and re-transmit it to gain access. Passive entry system is using fixed code (usually 24 bit/40 bit) every time to authenticate a key. In high-level, these are active and passive entry systems. There are two main RF remote key methods currently available. My main goal of this instructable is to fill that gap, and explain how easy it is to hack basic remote keys. But most of them does not give the full picture of advantages/ disadvantages of using basic RF remote keys. There are several Instructables such as " Arduino 433Mhz Wireless Communication Rc Switch" explaining how to use generic RF remote keys. This hack can be used to open wide variety of security locks used in cheap after market car security systems to almost all cheap remote garage doors. Hope this will help someone to evaluate how secure/non-secure their so-called secure locking mechanisms fixed in cars or home garage doors. And note that this is for educational purpose only. This is my first instructable so please bear with me if I'm not clear enough.
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