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·ISAAC Random Number Generator  

At the time of writing, the ISAAC home page can be found at  
ISAAC has been placed into the public domain by its author, Bob Jenkins in 1996.  
My random number generator, ISAAC.  
(c) Bob Jenkins, March 1996, Public Domain  
You may use this code in any way you wish, and it is free. No warrantee.  

·RSA Public Key Encryption  

The RSA algorithm was patented until September 2000 when RSA® Security Inc. released the algorithm into the public domain. "BEDFORD, Mass., September 6, 2000 -- RSA® Security Inc. (NASDAQ: RSAS) today announced it has released the RSA public key encryption algorithm into the public domain, allowing anyone to create products that incorporate their own implementation of the algorithm." At the time of writing a copy of this statement can be found at  

·Twofish Block Cipher  

The Twofish block cipher by Counterpane Labs was developed and analyzed by Bruce Schneier, John Kelsey, Doug Whiting, David Wagner, Chris Hall and Niels Ferguson. Twofish was one of the five Advanced Encryption Standard finalists. At the time of writing the Twofish homepage can be found at The cipher has been made available to the general public by the following statement on :  
" Twofish is unpatented, and the source code is uncopyrighted and license-free; it is free for all uses. Everyone is welcome to download Twofish and use it in their application. There are no rules about use, although I would appreciate being notified of any commercial applications using the algorithm so that I can list them on this website. "  

·ZLIB Compression Library  

ZLIB is a lossless data-compression library written by Jean-loup Gailly and Mark Adler. ZLIB is made  
available as free, unpatented software to the general public at The license  
conditions are set forth at and reproduced below :  
" Copyright (C) 1995-2002 Jean-loup Gailly and Mark Adler  
This software is provided 'as-is', without any express or implied  
warranty.  In no event will the authors be held liable for any damages  
arising from the use of this software.  
Permission is granted to anyone to use this software for any purpose,  
including commercial applications, and to alter it and redistribute it  
freely, subject to the following restrictions:  
1. The origin of this software must not be misrepresented; you must not  
   claim that you wrote the original software. If you use this software  
   in a product, an acknowledgment in the product documentation would be  
   appreciated but is not required.  
2. Altered source versions must be plainly marked as such, and must not be  
   misrepresented as being the original software.  
3. This notice may not be removed or altered from any source distribution.  
Jean-loup Gailly  
Mark Adler "  


The RIPE message digest was written by Antoon Bosselaers for Katholieke Universiteit Leuven, Department of Electrical Engineering ESAT/COSIC, Belgium. License conditions ask us to quote the following :  

" RIPEMD-160 software written by Antoon Bosselaers,   
available at "  

·SecExMail/SecExClipboard Cipher  
Chris Kohlhepp and Mark Robertson, Bytefusion Ltd.  

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