Re: [TLS] Possible blocking of Encrypted SNI extension in China

2020-08-10 Thread Christopher Wood
On Sun, Aug 9, 2020, at 8:31 PM, Peter Gutmann wrote: > >From the writeups I've seen, what they're blocking is TLS 1.3, not ESNI. > Since ESNI can be de-anonymised with a high degree of success (see various > conference papers on this) For the benefit of the list, would you mind sharing these ref

Re: [TLS] Possible blocking of Encrypted SNI extension in China

2020-08-10 Thread David Fifield
On Sun, Aug 09, 2020 at 11:15:25PM -0700, Christian Huitema wrote: > > On 8/9/2020 8:31 PM, Peter Gutmann wrote: > > >From the writeups I've seen, what they're blocking is TLS 1.3, not ESNI. > > Please check David Fitfield's message above in the thread. The research > that he quoted is quite spec

Re: [TLS] Possible blocking of Encrypted SNI extension in China

2020-08-10 Thread Salz, Rich
David, thanks for the detailed note. I just want to confirm that we haven't seen plain TLS 1.3 blocked either. We use it for our server-server traffic. ___ TLS mailing list TLS@ietf.org https://www.ietf.org/mailman/listinfo/tls

[TLS] Conclusion of the Adoption Call for draft-wang-opsec-tls-proxy-bp

2020-08-10 Thread Jen Linkova
The call for adoption for draft-wang-opsec-tls-proxy-bp has ended. The chairs believe that there is insufficient support and no consensus to adopt this document as a OpSec WG document. During the adoption call there were a number of comments on the document scope and technical details the documen

Re: [TLS] Possible blocking of Encrypted SNI extension in China

2020-08-10 Thread Peter Gutmann
Christopher Wood writes: >For the benefit of the list, would you mind sharing these references? I handwaved this one because I don't catalogue these things and didn't want to try and re-locate every preprint, paper, and report that's drifted across my desk in the last 6-12 months to try and find

Re: [TLS] Possible blocking of Encrypted SNI extension in China

2020-08-10 Thread Christian Huitema
On 8/10/2020 9:26 PM, Peter Gutmann wrote: > Christopher Wood writes: > >> For the benefit of the list, would you mind sharing these references? > I handwaved this one because I don't catalogue these things and didn't want to > try and re-locate every preprint, paper, and report that's drifted ac

Re: [TLS] Possible blocking of Encrypted SNI extension in China

2020-08-10 Thread Peter Gutmann
Christian Huitema writes: >Fingerprinting is a real issue but from the reports, this is not what is >happening here. Sure, I was just pointing out that they're using the brute-force approach now but presumably at some point will stop blocking when they've implemented a way to bypass it. My gues

Re: [TLS] Possible blocking of Encrypted SNI extension in China

2020-08-10 Thread Rob Sayre
On Mon, Aug 10, 2020 at 10:33 PM Peter Gutmann wrote: > Christian Huitema writes: > > >Fingerprinting is a real issue but from the reports, this is not what is > >happening here. > > Sure, I was just pointing out that they're using the brute-force approach > now > but presumably at some point wi

Re: [TLS] Possible blocking of Encrypted SNI extension in China

2020-08-10 Thread Peter Gutmann
Rob Sayre writes: >Do you think this fingerprinting will work with the newer ECH design, if the >client can add arbitrary content to the encrypted payload? ECH doesn't have any effect on web site fingerprinting so unless I've misunderstood your question the answer would be "N/A". Peter. __

Re: [TLS] Possible blocking of Encrypted SNI extension in China

2020-08-10 Thread Rob Sayre
On Mon, Aug 10, 2020 at 10:58 PM Peter Gutmann wrote: > Rob Sayre writes: > > >Do you think this fingerprinting will work with the newer ECH design, if > the > >client can add arbitrary content to the encrypted payload? > > ECH doesn't have any effect on web site fingerprinting so unless I've >

Re: [TLS] Possible blocking of Encrypted SNI extension in China

2020-08-10 Thread Christian Huitema
On 8/10/2020 11:14 PM, Rob Sayre wrote: > On Mon, Aug 10, 2020 at 10:58 PM Peter Gutmann > mailto:pgut...@cs.auckland.ac.nz>> wrote: > > Rob Sayre mailto:say...@gmail.com>> writes: > > >Do you think this fingerprinting will work with the newer ECH > design, if the > >client can add