[tor-access] Specification for bypassing CAPTCHAs using blinded tokens

[Alex Davidson]

Hi everyone,

I've been interning at Cloudflare for the past 3 months and have been
working on developing an implementation of the blinded tokens spec that
George and Filippo developed a while back.

We've updated aspects of the original spec, the newest spec can now be
viewed here: https://github.com/cloudflare/challenge-bypass-specification.
We're happy to hear comments from any of you on the design and on the
capacity of the solution for preserving anonymity.

We've managed to build a test copy of the protocol along with an extension
that carries out the required operations. The extension is not completely
finished yet, but we're looking towards making that open source as well
when it is done.

Thanks,
Alex
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