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由 Bradley Buda 提交于
This merges in the code from the breach-mitigation-rails gem that masks authenticity tokens on each request by XORing them with a random set of bytes. The masking is used to make it impossible for an attacker to steal a CSRF token from an SSL session by using techniques like the BREACH attack. The patch is pretty simple - I've copied over the [relevant code](https://github.com/meldium/breach-mitigation-rails/blob/master/lib/breach_mitigation/masking_secrets.rb) and updated the tests to pass, mostly by adjusting stubs and mocks.
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