[tor-commits] [tor/master] Update changes file.

[nickm at torproject.org]

commit 08da247042a106fbf8a437b7cd25460b0f2ee045
Author: Mike Perry <mikeperry-git at fscked.org>
Date:   Sun Dec 9 23:58:01 2012 -0800

    Update changes file.
---
 changes/bug7157 |   11 +++++++++++
 1 files changed, 11 insertions(+), 0 deletions(-)

diff --git a/changes/bug7157 b/changes/bug7157
index fad3977..4f0e3b3 100644
--- a/changes/bug7157
+++ b/changes/bug7157
@@ -13,3 +13,14 @@
      in combination with PathBiasExtremeRate.
    - Increase the default values for PathBiasScaleThreshold and
      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.