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wizardishungry

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That seems like a perfectly good solution to me. Storing a hash of each signature is say 256 bytes and supposing an upper limit of 10,000 signatures, the database file is pretty small. (Better hope they sign the signature database though)

Holy Libertarian hyperbole:

He convinces the FCC to require right-wing channels to link to left-wing channels, Christian channels to link to Muslim channels, vegetarian channels to link to meat-eating channels. "The [linking] icon itself would not require anyone to read anything," Sunstein writes. "It would merely provide a signal, to the viewer, where a different point of view might be consulted." The FCC approves Sunstein's plan for a "Fairness Doctrine" for the online world, and the FCC sets up a new Bureau of Links to enforce the practice.

You wouldn't need 4096 if the choice of the salt was non-random; some versions of Unix used the first 2 characters of the username. What's the space requirement for a single rainbow table?

Does anyone have any more specific information on whether they just called crypt(key,salt) or actually used a larger salt with a call to encrypt()? The crypt() function only takes a 12 bit salt which is marginally helpful against rainbow tables.