Hello Gopi,
I may be wrong I've found a lot of links about SSH version 2 but very few mentions of SSH version3.
SSH version 2 is described in RFC4253 of January 2006
http://www.ietf.org/rfc/rfc4253.txt
wikipedia doesn't mention SSH version 3.
http://en.wikipedia.org/wiki/Secure_Shell
I've found SSH version 3 mentioned here
http://charlotte.at.northwestern.edu/bef/SSHdist.html
but it reports to SSH communications website
Hope to help
Giuseppe