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            This is a file from the  Wikimedia Commons. Information from its  description page there is shown below.  Commons is a freely licensed media file repository.  You can help. 
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        Summary 
        Composite picture of public-key cryptography inventors Whitfield Diffie and Martin Hellman. Sources:  en:Image:Whitfield Diffie.png (photo by Mary Holzer licensed under CC-BY) and  en:Image:Martin-Hellman.jpg uploaded by  Matt Crypto (apparently originated from Martin Hellman) licensed under GFDL.
         Licensing 
        
         
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          Permission is granted to copy, distribute and/or modify this document under the terms of the  GNU Free Documentation License, Version 1.2 or any later version published by the  Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled  GNU Free Documentation License.  http://www.gnu.org/copyleft/fdl.htmlGFDLGNU Free Documentation Licensetruetrue 
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       File usage
       
        The following pages on Schools Wikipedia link to this image (list may be incomplete):
        
        
       
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