Re: Unique number generation

From: Jean-Luc Cooke (jlcooke_at_engsoc.org)
Date: 05/02/05 

Date: 2 May 2005 14:05:41 GMT

Tom St Denis <tomstdenis@gmail.com> wrote:
> > Unfortunately, not a power of 2, nor even a power of 10. So, if I
> > wanted a number that would appear to be random to someone without
> > knowledge of the key, e.g. equally distributed over the output
> > range, of let's say 0-250000000, what would you suggest then?

> Repeated draws. This has been discussed on sci.crypt before.

I think he wants to invert his numbers back to a sequence # as well tom.
That's is problem.

He wants to issue random IDs, and later be able to verify them for
valitiy without a lookup database.

In short, his design goals arn't in lign with security. The parking
meters in Ottawa have the same problem. They issue smart cards that
help you save carrying change, but the meters don't talk back to home
base to verify the smart card is valid. You can just:
  dd if=/dev/smartcard1 of=myFullSC.img

And once you've spent your $25 on the SCard, you:
  dd if=myFullSC.img of=/dev/smartcard1

And bob's your uncle.

JLC

Relevant Pages

  • Re: Unique number generation
    ... > I think he wants to invert his numbers back to a sequence # as well tom. ... > meters in Ottawa have the same problem. ... They issue smart cards that ... > base to verify the smart card is valid. ...
    (sci.crypt)
  • Re: libtomcrypt.org dns hijack
    ... |> Tom St Denis wrote: ... |>> My signing key as always will verify this message. ... blah blah blah you're a stupid sod. ... of your obvious and blatant trolling and the secondary trolling you get ...
    (sci.crypt)
  • Re: Has anyone really cracked anything recently?
    ... > Tom St Denis writes: ... What about things like smart cards? ... If a 768-bit RSA key and a 80-bit symmetric key is ... strong enough for a given task why waste money? ...
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  • Re: Collisions for Hash Functions MD4, MD5, HAVAL-128 and RIPEMD
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  • RE: schedule backup failure
    ... need help in turning off verify in the backup. ... there are no switches set therefore the default is verity / yes ... > Hello Tom, ... > This posting is provided "AS IS" with no warranties, ...
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