On 7 Oct 2015, at 10:52, Brandon Wiley brandon@blanu.net wrote:

Hello! I am a researcher focusing on blockability of Tor connections. If you have pcap files that you would like to share showing Tor SSL connections that have been blocked and non-Tor SSL connections that have not been blocked, this would be helpful for my research. I have this pcap analysis framework: https://github.com/blanu/AdversaryLab-offline https://github.com/blanu/AdversaryLab-offline as well as this transport for Tor that uses the analysis to find an optimal encoding so that Tor connections are not blocked: https://github.com/blanu/Dust https://github.com/blanu/Dust So essentially given two sets of pcaps, one for blocked connections and one for unblocked connections, I can automatically unblock Tor connections.

I’m sorry, I only have a pcap file for blocked Tor connections.

If you don't have pcap files or you don't want to share them, if you have access to a network that blocks Tor in a reproducible way, perhaps we could run some tests

I’m sorry, I no longer have access to that network.

Let me know if you're interested!

On Tue, Oct 6, 2015 at 6:06 PM, Tim Wilson-Brown - teor <teor2345@gmail.com mailto:teor2345@gmail.com> wrote: Hi All,

This morning I observed a “free wifi” network blocking tor’s SSL connections. While other SSL connections from my machine went through, I observed multiple network traces of tor completing a TCP 3-way handshake, and then getting no reply to the first SSL packet it sent.

I think they may have been blocking unknown or untested certificates, but I can’t be sure.

Still, I was able to use meek(-google) to access tor.

Has anyone else seen this kind of blocking behaviour? (Is this the right list?)

Tim

Tim Wilson-Brown (teor)

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teor at blah dot im OTR CAD08081 9755866D 89E2A06F E3558B7F B5A9D14F

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Tim Wilson-Brown (teor)

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