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Update changes file.
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@ -13,3 +13,14 @@
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in combination with PathBiasExtremeRate.
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- Increase the default values for PathBiasScaleThreshold and
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PathBiasCircThreshold from 200 and 20 to 300 and 150, respectively.
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- Add in circuit usage accounting to path bias. If we try to use a
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built circuit but fail for any reason, it counts as path bias.
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Certain classes of circuits where the adversary gets to pick your
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destination node are exempt from this accounting. Usage accounting
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can be specifically disabled via consensus parameter or torrc.
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- Convert all internal path bias state to double-precision floating
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point, to avoid roundoff error and other issues.
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- Only record path bias information for circuits that have completed
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*two* hops. Assuming end-to-end tagging is the attack vector, this
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makes us more resilient to ambient circuit failure without any
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detection capability loss.
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