Public/private keys are only used for authentication on connection
start. During comunication the data is encripted with other key.

2006/10/5, Jeff Sadowski :
> I would like to write a program that could deycrypt ssh communication
> by using the private key of the server computer. This should be
> possable right? And I should be able to use libraries the openssh has
> already writen. In fact the majority of the code should already be
> writen right? I should just need to send a packet with the private key
> to a function right?