encrypted tapes (was Re: Papers about "Algorithm hiding" ?)

[lists at notatla.org.uk]

From: "Charles M. Hannum" <root at ihack.net>

> I can name at least one obvious case where "sensitive" data -- namely credit 
> card numbers -- is in fact something you want to search on: credit card 
> billing companies like CCbill and iBill.  Without the ability to search by 
> CC#, customers are pretty screwed.

Is there a good reason for not searching by the hash of a CC# ?

http://www.wayner.org/books/td/

http://www.unixwiz.net/techtips/secure-cc.html
I think the author is planning further work on this site and
would be happy to receive constructive comments.

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