Shevek (shevek) wrote,

If we assume that SHA1 generates a uniform hash, and that a base-64 encoding of a SHA1 checksum is therefore a random character string containing 160 bits of information, then how many registration codes can our web site generate before a customer gets an accidental expletive, and how fast will the aforesaid customer complain? Given that figure, and the rate of registrations, it will be possible to fairly accurately predict the date on which I will get fired.

Given the amount of technology the DMV use to prevent people from having cusswords on their numberplates, I'm not sure that there's really a quick and easy solution. Do the captcha people have any nice solutions?
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