Re: Random Number Help

On Dec 29, 4:45 am, Elias Yarrkov <yarr...@xxxxxxxxx> wrote:
On Dec 29, 12:39 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.

I just noticed the page you mention uses Javascript for generating the
keys, so it's done locally. But its quality depends on your browser's
PRNG (which probably isn't really designed for generating
cryptographic keys).



Thank you very much indeed.

Best Regards,

-- yarrkov

You can do lot of things with javascript including building your own
pRNG. Start from scratch for full customization. It is true that
overusing a pRNG can produce weird results, like interference
patterns. You could use several, even generate a longer sequence to
start with rather than combining lesser results. There are many
methods and all there for the finding. I see key generation as a
rather private matter so don't tell all for security's sake. I do
separate transparency in actual encryption algorithms from best kept
obscure keys and how to make them, a longer form of a password.
.

Relevant Pages

  • Re: RSA Keys and Measures of Randomness
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