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Rapid7 :
http://www.rapid7.com/
IETF Draft, SSH Transport Layer Protocol :
http://www.ietf.org/internet-drafts/draft-ietf-secsh-transport-15.txt
IETF Draft, SSH Protocol Architecture :
http://www.ietf.org/internet-drafts/draft-ietf-secsh-architecture-13.txt