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@@ -26,6 +26,10 @@ Here are some papers that are potentially of interest.
 
 #### Hash-Based Digital Signatures
 
+[XMSS - A Practical Forward Secure Signature Scheme based on Minimal Security Assumptions](http://eprint.iacr.org/2011/484) by Buchmann, Dahmen, Hülsing; “the first provably forward secure
+and practical signature scheme with minimal security requirements: a pseudorandom and a second preimage resistant (hash) function family. Its signature size is reduced to less than 25% compared to
+the best provably secure hash based signature scheme.”
+
 [Digital Signatures out of Second-Preimage Resistant Hash Functions](http://www.cdc.informatik.tu-darmstadt.de/~dahmen/papers/DOTV08.pdf) by Dahmen, Okeya, Takagi, Vuillame; This scheme is secure as long as the underlying hash function has *second-preimage resistance*, which real hash functions are a lot more likely to have than to have a stronger property like *collision-resistance*.
 
 [Hash-based Digital Signature Schemes](http://www.cdc.informatik.tu-darmstadt.de/~dahmen/papers/hashbasedcrypto.pdf) by Buchmann, Dahmen, and Szydlo; A survey of why it might be a good idea.