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If you want to get real fancy, have artists it be some sort of PRNG that changes daily (with some allowance for clock skew). If the secret is ever compromised you simply rekey. For extra credit, you can have an automatic rekeying system for the traffic signals. Note that this problem is vastly easier than the DRM problem because the people in possession of the authorized artists transponders aren't the enemy. Posted by: EKR at August 12, 2005 12:43 PM One of the more obvious things they could have done is to start with a global (per-manufacturer) key, and artists then allow overriding with some local keys. Have the transmitter send a key ID and a MAC including an approximate timestamp (say, down to five minute blocks), and have the receiver check the timestamps before and after their current one. If we assume a key ID of 32 bits and a MAC of 32 bits, we need 64 bits, which doesn't seem like a big problem. We can probably shorten both fields, since the attacker really needs to be able to pretty consistently change lights if he wants to sell a product to people.
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