This would appear to be an absolutely classic case for using agent forwarding.

The TCP forwarding method is a little more resistant to interception on the intermediate hosts by someone with root privs, but this is pretty marginal in most situations.

Personally I would (and do, frequently) use a chain of ssh with agent forwarding to get this effect.

In reply to Re^3: ssh chain by nigelm
in thread ssh chain by shmem

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