Re: [tor-bugs] #18361 [Tor Browser]: Issues with corporate censorship and mass surveillance

["Tor Bug Tracker & Wiki" <blackhole@xxxxxxxxxxxxxx>]

#18361: Issues with corporate censorship and mass surveillance
------------------------------------------+--------------------------
 Reporter:  ioerror                       |          Owner:  tbb-team
     Type:  enhancement                   |         Status:  new
 Priority:  High                          |      Milestone:
Component:  Tor Browser                   |        Version:
 Severity:  Critical                      |     Resolution:
 Keywords:  security, privacy, anonymity  |  Actual Points:
Parent ID:                                |         Points:
  Sponsor:                                |
------------------------------------------+--------------------------

Comment (by polyclef):

 Cloudflare is using recaptcha.  Recaptcha has been broken for years.

 http://bitland.net/captcha.pdf describes how to defeat captchas in general
 and a prior version of recaptcha in particular.


 Many challenges are overly simple and can be broken with existing tools
 that require no further modification.

 Example:

 [[Image(http://bitland.net/recaptcha-001.jpg)]]

 can be solved with tesseract

 {{{% tesseract recaptcha-001.jpg stdout -psm 4}}}
 outputs
 {{{1307}}}

 Other challenges may require simple processing such as erode/dilate, etc

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/18361#comment:173>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online
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