Article:		Atom Authentication
Subject:		Patent status?
Date:		2003-12-19 12:00:28
From:		Micah Dubinko
What is the patent status of SHA1?

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• Patent status?
  2003-12-21 22:37:47 Mark Pilgrim [Reply]
  
  SHA-1 is not patent-encumbered, according to this letter from NIST dated June 24, 1998: http://grouper.ieee.org/groups/1363/P1363/letters/NIST.txt

  
  .NET, Java, Perl, Python, and PHP all come with SHA-1 implementations, and there are multiple public domain SHA-1 implementations as well.