cybergibbons

This is the thing - it is virtually impossible to secure an executable such that you can't get the algorithm out. The security has to be in the key (the secret). If the key is only 8 bits, then guessing it isn't going to be hard. Have their been many changes in anti-codes recently? Do new panels have new decoders? Which standard or body is it that dictates how anti-codes are used?

Another question about impressions of security. I'm looking at anti-codes at the moment, which seem common on monitored systems. Typically this takes a 5 digit quote code along with a secret seed, and generates a 5 digit reset code (along these lines, anyway). It turns out for the few decoders I have now looked at, the secret seed can be determined from a one or two pairs of quote/reset codes. If this seed was constant across an entire installer or manufacturer, this could present a risk. What are your thoughts on this?