CDR: Re: any good idea?

[Ken Brown]

This is not a very good place to ask these sort of questions  because
(a) the list is meant to be about the use and  politics and economics of
crypto-technology (b) loads of people and (c) well... I could tell you
half a dozen ways but I would be making it up and you ought not to trust
me. There are mailing lists and newsgroups more directly about the
details of cryptography.

Check out some maths books in a library. Or try to find a copy of Bruce
Schneier's Applied Cryptography book. Or use your search engine of
choice to find web pages discussing "hashing algorithms", "checksums",
"authentication",  & the like.

Ken Brown


Kenix wrote:
> 
> hi all,
>     suppose we have two numbers, one is serial added(about 8~10 digits),
> another is a random number(about 7~12 digits), then how can i generate a 5
> digits number depends on both of them? there shouldn't have any key so i can
> verify the 5-digit number later just use the pervious two numbers, i know
> the security is completely depends on the method that how to generate this
> 5-digit number.
>     any good method you all can hint me? any good random number generator?
> 
> TIA.
> Kenix