Hi, You mention architectural problems in Mondex. Do you have any hard info on the specs? I'm trying to find someone who does who is willing/able to talk. One thing that struck me was that each Mondi would need to have both the secret and public parts of a public key incorporated (if thats what they are doing) hence what is the advantage of public key? Yet they have an on chip modular exponentiation device on the new silicon rev... Looking at the secrecy stuff on Mondex, I suspect I would take the same approach, not to protect the core protection but so as to permit a gradual approach to penetration detection. I would expect some type of tripwire to be built into the device such that a fraud attempt apparently succeeds but indicates that there is a problem. Phill