Arbitrary Precision C Source Library

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2 total messages Started by Jason Lisenchuk Tue, 29 Mar 1988 01:33

#4174

Author: Jason Lisenchuk
Date: Tue, 29 Mar 1988 01:33

16 lines
1151 bytes

I plan to write a C program to implement the RSA (Rivest-Shamir-Adleman)
Public Key Cryptosystem.  Because the scheme requires large block lengths
for security, I require arbitrary precision arithmetic functions.  I'd
like to port the program to a PC eventually, therefore I ultimately need
a source library of these functions.  If you know of such a library in 
the public domain, please post/email information as to how I could get a copy.
Please do not email the library. 

Alternatively, please inform me if you know of any robust RSA programs.  I
imagine such a program will soon become standard on Unix as the crypt()
function implements the much-maligned DES. 

Jason J. W. Lisenchuk
4B Computer Science, Combinatorics and Optimization
Faculty of Mathematics
University of Waterloo

Re: Arbitrary Precision Library (RSA)

#4151

Author: paul gilna
Date: Thu, 31 Mar 1988 05:01

35 lines
2173 bytes

In article <6051@watdragon.waterloo.edu>, jjwlisenchuk@rose.waterloo.edu (Jason Lisenchuk) writes:
> I plan to write a C program to implement the RSA (Rivest-Shamir-Adleman)
> Public Key Cryptosystem....
> 
> Alternatively, please inform me if you know of any robust RSA programs.

Before you go investing much time in this pursuit, you should know that
RSA Data Security, Inc. of Redwood City, CA is actively defending it's
exclusive license of MIT's RSA patent.  While this isn't supposed to be
an algorithm patent, they have sued us (DIGITAL SIGNATURE of Chicago, IL)
in U.S. District Court over our software implementation of an RSA/DES
hybrid cryptosystem (the package also includes pure RSA).  Even though
we've had minimal commercial success with our package they felt it 
necessary to take action against us.  We appear to be about to reach an
out-of-court settlement of the matter, but take my word for it, the 
experience has been expensive and none too pleasant.

The best bet at this point seems to be to raise the $3000 or so it would
cost to have the patent office review their claims (many of which are
rediculous).  But even this will probably involve quite a fight, as they
appear to have raised a substantial amount of venture capital and are
quite willing to throw much of it away on legal fees.

Michael J. Markowitz
Digital Signature
5453 S. Woodlawn
Chicago, IL  60615
(312) 324-6533

(please do not reply by EMAIL as this isn't my account--thanks.)

-- 
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Just because you're paranoid, doesn't mean they're not out to get you.

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