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change code

The change code is a coding method

used in radio car keys. A change code works with changing code numbers and a code counter. During authentication, the handheld transmitter and the receiving device increment the counter to the next higher digit that has a different code number stored in it. If the receiving device does not receive a code digit and the counter digit, then it decodes the current counter digit and increments the counter or it starts again from the first code digit. The counter digit and the code number are transmitted in encrypted form.

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Englisch: change code
Updated at: 25.04.2016
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