Heres a stumper (for me at least, and the answer is probably dead easy):<BR><BR>MachineA(os10.6):<BR>$ ssh-keygen -t rsa -f id_rsa -N ''<BR>$ ssh-keyscan -t rsa ...
Disabling the ssh-rsa type of key will be a big issue though for those using smartcards to authenticate. A big usecase of OpenPGP cards is authenticating over SSH, and not being able to do this ...