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The following archive was created by hippie-mail 7.98617-22 on Fri Aug 21 1998 - 17:20:26 ADT
Cicero (cicero@redneck.efga.org)
16 Jul 1998 10:07:31 -0000
John Kelsey writes:
< initial response was to:
>are there tools for taking a set of random
>numbers dispersed according to a non-uniform distribution, like a
>poisson or normal distribution, and turning them into a set of random
>numbers over a uniform distribution?
>> >>What do you see as the problems with:
>> >> 1. Hash the data
>> >> 2. Encrypt the data in CBC mode with the hash as key
>> >>If the hash and cipher are both strong, this should be good.
>Right. I will raise one point with this scheme, though: You
>actually lose a small amount of entropy here, since you can't use the
>output from this to go back to the input. I don't see this as being
>important with any real buffer size, but it's at least a theoretical
>complaint.
If I were to retain the value of the hash, I could later decrypt the
CBC-encrypted data, returning it to its original state. This
invertibility proves conservation of entropy.
Perhaps you meant something else than what I am presuming you did?
>
>--John Kelsey, kelsey@counterpane.com / kelsey@plnet.net
>NEW PGP print = 5D91 6F57 2646 83F9 6D7F 9C87 886D 88AF
Cicero
The following archive was created by hippie-mail 7.98617-22 on Fri Aug 21 1998 - 17:20:26 ADT