Date: Fri, 05 Mar 1999 18:17:27 +1000 From: Greg Black <gjb@comkey.com.au> To: cjclark@home.com Cc: stuyman@confusion.net (Laurence Berland), questions@FreeBSD.ORG Subject: Re: Crypt Message-ID: <19990305081727.15120.qmail@alpha.comkey.com.au> In-Reply-To: <199903050455.XAA09072@cc942873-a.ewndsr1.nj.home.com> of Thu, 04 Mar 1999 23:55:59 EST References: <199903050455.XAA09072@cc942873-a.ewndsr1.nj.home.com>
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> > If anyone can either point me to the code > > or (and this would make me very happy) tell me the mathematical formulas > > on which one of these (or a more basic version of these) schemes works. > > It's all about factorization, division, and modulo operations on very > large whole numbers. If you are really interested in cryptography, > there are many, many sources that will be much better to start at than > source code. One of the best is Bruce Schneier's book "Applied Cryptography" which describes, analuses, and provides source code for just about every cryptographic algorithm ever heard of. > > On a related note the following statement confuses me, what does > > "Because neither > > of these functions involve encryption, they are believed to be > > exportable from the US and importable into many other countries." Mean?? > > How do they (the sentence refers to Williams insecure function and MD5) > > not encrypt?? If they don't encrypt what do they do, and how does that > > differ from DES?? MD5 produces a cryptographic checksum, but you can't get from the checksum back to the input that produced it. Hence it's not a method of encryption, but a fingerprinting technique that can be used to verify the correctness of some data. Get hold of and read the literature for more information. -- Greg Black <gjb@acm.org> To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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