RSA Labs FAQ -- Q28: Is the Use of DSA Covered by Any Patents?

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### Question 28. Is the Use of DSA Covered by Any Patents?

David Kravitz, former member of the NSA, holds a patent on DSA [Kra93]. Claus P. Schnorr has asserted that his patent [Sch91] covers certain implementations of DSA. RSA Data Security has also asserted coverage of certain implementations of DSA by the Schnorr patent.

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