Remote controls send a digital code word to the receiver. If the receiver determines the codeword is acceptable, then the receiver will actuate the relay, unlock the door, or open the barrier. Simple remote control systems use a fixed code word; the code word that opens the gate today will also open the gate tomorrow. An attacker with an appropriate receiver could discover the code word and use it to gain access sometime later. More sophisticated remote control systems use a rolling code (or hopping code) that changes for every use. An attacker may be able to learn the code word that opened the door just now, but the receiver will not accept that code word for the foreseeable future. A rolling code system uses cryptographic methods that allow the remote control and the receiver to share codewords but make it difficult for an attacker to break the cryptography?

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?Quanzhou Juhui Electronic Co., Ltd...Is a high-tech company that specializes in designing, manufacturing and selling Alarm system (motorcycle alarm system, electric vehicles), motorcycle power lock, wireless RF receiver (remote controller), RF Remote control ( keyfob and transmitter), RF module (wireless transmitter Module and Receiver Module), Remote Control Duplicator( face to face copying duplicator and machine copy duplicator), Our alarm systems are widely used in every brand motorcycle and electric vehicles. There are many alarm models in different prices for your choices. Our high quality RF wireless remote control, remote control duplicator and receiver are widely used as advanced accessory in garage door, rolling door, sliding gate, motorcycle alarm etc. Our company professional R&D staff can meet your different request. We provide different kinds of products with high quality and favorable price. We are still developing and designing new products according to market demand. We stick to management principle: Quality first, service first, continuous improvement and innovation. Our quality objective is "zero defect, zero complaint". We hope to promote mutual benefit and build long term business with customers all over the world by joint efforts.

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