keychain remote coding

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Can anyone help me on keychain remote coding.
i know about rf transmitters and recievers, i have used these with
encoders and decoders.
but this is not secure. i have heard about keyfob transmitters and
rolling code. how to use this and how to design such keychain remotes.

Thank you.

Re: keychain remote coding
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Look for KEELOQ at
It's perfect for keyfobs.

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