Alan: I am using a data ... and no rolling code required. The data will be a single byte. I have not received a reply from Microchip on my Keeloq application and am starting to look at workarounds (the encoders and decoders I've found (not many around) are costly for the application). I'm considering using a hard encoded value to use as a header to communicate with the receiver (my own design as well). Since there may be multiple transmitters (users decision), I'm considering adding a secondary unique address (3 bit; 8 addresses) to the transmission header and hard code the receivers to act according to the input. I think that'll work for this application. This idea seem workable? Any other encode / decode ideas? Thanks! Rich -----Original Message----- From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu]On Behalf Of alan smith Sent: Monday, February 05, 2007 10:44 AM To: Microcontroller discussion list - Public. Subject: Re: [PIC] KeeLoq PICS and RF Secure Transmission Do you need a rolling code security arrangement? What kind of data are you transmitting..ie...control signals or an actual data stream? "Richard J. Pytelewski" wrote: Has anyone gone thru the hurdles of implementing KeeLoq security in Pics? I am needing to RF data transfer and KeeLoq looks possible for new product development. Microchip requires a Confidentiality Agreement. They apparently send you a disk with code. Are there license fees involved? Any experience in their ease of incorporation into programs? Looking at their datasheets it looks like its proprietary code that is incorporated into your program. Are there any other security chips I should consider. As always, cost is an issue. Any help and input would be appreciated. Rich PSI Systems -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist --------------------------------- Expecting? Get great news right away with email Auto-Check. Try the Yahoo! Mail Beta. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist