[tor-dev] obfs4, meek, active probing and the timeline of pluggable transports

[David Fifield]

On Sat, Oct 27, 2018 at 05:20:06PM +0530, Piyush Kumar Sharma wrote:
> 3.) I searched a lot but could not find the timeline in which pluggable
> transports were built. As in what was developed and deployed first, obfs4 or
> meek?

For questions like this, see our metrics timeline page:
https://trac.torproject.org/projects/tor/wiki/doc/MetricsTimeline

The three transports meek, ScrambleSuit, and obfs4  were deployed in Tor
Browser roughly at the same time. ScrambleSuit was a predecessor of
obfs4 that also deals with active probing. meek and ScrambleSuit were
first in 4.0-alpha-1 (Aug 2014) and 4.0 (Oct 2014). obfs4 was first in
4.5-alpha1 (Nov 2014) and 4.5 (Apr 2015).