OpenSSH and keystroke timings

Howard Chu hyc at
Wed Sep 9 07:44:00 EST 2009

Old news, but ...

I first posted about this back in 2001 and it's still not resolved:

1) high latency networks are a reality that will never go away. In fact they 
will only become more prevalent since distributed networks continue to grow 
broader but (surprise) the speed of light remains a constant.
2) character-at-a-time protocols have both security and performance costs.
3) a solution for this has existed in common operating systems for a couple of 
decades already (LINEMODE tty support).

It's strange how the secsh group at the IETF refused to learn from the lessons 
already gained from the years of experience with the telnet protocol.
   -- Howard Chu
   CTO, Symas Corp. 
   Director, Highland Sun
   Chief Architect, OpenLDAP

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