Re: Secure permutations on non-power-of-2 ranges?

From: Bodo Moeller (bmoeller_at_acm.org)
Date: 08/26/05 

Date: Fri, 26 Aug 2005 19:23:06 +0000 (UTC)

David Wagner <daw@taverner.cs.berkeley.edu>:

>> Indeed, but we'd rather store a sequence number and a postion in the
>> series than about 235MB of shuffled numbers.

> That's surprising. 235MB of data is what, a few tens of cents worth of
> hard disk space these days?

Maybe, but that's only as long as one doesn't think one needs a
back-up concept. If they want to keep back-ups of their data, they
have to factor in additional media cost as well as the time required
for reading and writing the data when back-ups are made. 235 MB still
isn't an awful lot, but the total cost of having a 235 MB file is
more than that of the mere hard disk space.