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