Introduction: A decoder is a device that restores information from its encoded form to its original form. When coding data is lost, staff can use the decoder to restore the initial settings, which is also easily exploited by criminals. In some unattended banks, criminals install their own "decoder" on the access control card swiping system, and depositors swipe their cards into the door. The bank card information is stored on their decoder. At the same time, they installed cameras on ATM machines to capture the bank card passwords of depositors. Once they steal the bank card information and password, they pass it on to their accomplices through the internet, decipher it, and then "clone" it. Then, they use the copied "clone card" to withdraw funds in a different location. [1] Decoder is an important front-end control device. Under the control of the host, the front-end device can generate corresponding actions. Decoder, also known as Receiver/Driver or Telemetry in foreign countries, is a front-end device that provides driving power for controllable devices such as PTZ and zoom lenses, and communicates with control devices such as matrices. Usually, the decoder can control the up, down, left, and right rotation of the pan head, the zoom, focus, aperture of the zoom lens, and the control of protective cover wipers, camera power, lighting, and other equipment. It can also provide several auxiliary function switches to meet the practical needs of different users. The high-end decoder also comes with preset positions and cruise functions

Classification: Decoders are divided into software decoders, hardware decoders, and wireless decoders