Re: Random Number Help

On Mon, 29 Dec 2008 02:54:39 -0800 (PST), tomzhi <tomzhi27@xxxxxxxxx>
wrote:

On Dec 29, 6:39 pm, Elias Yarrkov <yarr...@xxxxxxxxx> wrote:
On Dec 29, 9:42 am, tomzhi <tomzh...@xxxxxxxxx> wrote:

If I combine two 128-bit random number into one 256-bit number, will
the 256-bit number still keeps its randomness properties?
If it's true, can I obtain a 2048-bit random number with integrating
16 128-bit random numbers into one?

Yes and yes.



If it's false, where can I find an online random number LOOK UP TABLE,
Library or Generator which can offer 2048-bit random number? I only
need 4 pairs of them, however it will be ideal if its randomness can
be highly assured.

I find a link of online random number generator, I wonder whether its
randomness can be assured.http://www.andrewscompanies.com/tools/wep.asp
If anyone could give any better reference or recommendation, I will be
very grateful.

For a number of reasons, getting your randomness from a third party
when working with cryptography is probably a very bad idea.



Thank you very much indeed.

Best Regards,

-- yarrkov


Thank you for your answer and I will try to find some reliable one.
Anyway, the information about the random number combination is helpful.
You may find RFC 4086 useful:
http://www.rfc-editor.org/rfc/rfc4086.txt

rossum

.

Relevant Pages

  • Re: Random Number Help
    ... can I obtain a 2048-bit random number with integrating ... however it will be ideal if its randomness can ... when working with cryptography is probably a very bad idea. ... keys, so it's done locally. ...
    (sci.crypt)
  • Re: Random Number Help
    ... the 256-bit number still keeps its randomness properties? ... can I obtain a 2048-bit random number with integrating ... however it will be ideal if its randomness can ...
    (sci.crypt)
Loading