Improving the SPHINCS post-quantum signature scheme
https://research.kudelskisecurity.com/2017/09/25/improving-the-sphincs-post-quantum-signature-scheme-part-1/ [research.kudelskisecurity.com]
2017-09-30 22:01
Plus part two: https://research.kudelskisecurity.com/2017/09/28/improving-the-sphincs-post-quantum-signature-scheme-part-2/
Simple (simpler, perhaps) explanation.
source: green