Stephane Favard wrote:
> 
> Hi to all,
> 
> Presently, I developping a RF Remote control using AUREL RFF Modules (433 Mhz) and 2 PIC 16F84 for Tx and RX. It works just fine but I
> would like implementing the Rolling Code.
> I'm searching any informations about Rolling Code Algorythme.
> Very thanks in advance if you can give me some links and (or) informations...

Microchip hold some patents for rolling code encryption. It 
was developed by a South African company (Nanotec) and Mchip 
bought it. Mchip calls it Keeloq.

Microchip have many application notes for the generation and 
decryption.

Note that Mchip requires a NDA if you want to get hold of the 
nuts & bolts. This also means that it is possible to break it 
if you know some unscrupulous people willing to violate their 
NDA with Microchip. For the record, I don't have any first 
hand knowledge of the algorythm, nor am I interested in it.

-- 
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