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Update changes file.

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Mike Perry 2012-12-09 23:58:01 -08:00
parent aa16d59ee7
commit 08da247042
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@ -13,3 +13,14 @@
in combination with PathBiasExtremeRate. in combination with PathBiasExtremeRate.
- Increase the default values for PathBiasScaleThreshold and - Increase the default values for PathBiasScaleThreshold and
PathBiasCircThreshold from 200 and 20 to 300 and 150, respectively. PathBiasCircThreshold from 200 and 20 to 300 and 150, respectively.
- Add in circuit usage accounting to path bias. If we try to use a
built circuit but fail for any reason, it counts as path bias.
Certain classes of circuits where the adversary gets to pick your
destination node are exempt from this accounting. Usage accounting
can be specifically disabled via consensus parameter or torrc.
- Convert all internal path bias state to double-precision floating
point, to avoid roundoff error and other issues.
- Only record path bias information for circuits that have completed
*two* hops. Assuming end-to-end tagging is the attack vector, this
makes us more resilient to ambient circuit failure without any
detection capability loss.