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

2018-10-27 Thread Sambuddho Chakravarty
Obfs4 can apparently solve most of the problems pertinent to identifying Tor bridge traffic by inspection of TLS headers... Meek relies on SNI field of TLS headers to communicate to bridges via a "front end ". >From an overall cursory glance it appears that obfs4 was introduced in 2014 while Meek

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

2018-10-27 Thread Carolin Zöbelein
Hi :), I can't give you an answer to your history questions, since I wasn't involved in the history of PTs but I have the feeling you have this fundamental question "Why we should work on an other PT, as long as the stuff which we already have works fine?" (?) Simple answer: You should always hav

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

2018-10-27 Thread Piyush Kumar Sharma
Hello all, I have a few specific questions related to the pluggable transports. 1.) I believe that obfs4 stops active probing(the latest problem as brought to notice by Ensafi et al, IMC 2015 and Shinying Cho, FOCI 2018), and hence discovering obfs4 Tor bridges using active probing is not possible