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commit 1272bd0db5ce44b76a8fb7aa50eb58fbcb66ce13 Author: Mike Perry mikeperry-git@torproject.org AuthorDate: Thu May 26 20:01:09 2022 +0000
Describe a potential (rare) distringuisher in idle circuits.
In the rare event that a user resumes activity after a period between the "reduced connection timeout" and the full value, and that user has not set reduced padding, this is a distinguisher on circuits that have been held idle and open for that long. --- padding-spec.txt | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/padding-spec.txt b/padding-spec.txt index 262e88f..ea16d8b 100644 --- a/padding-spec.txt +++ b/padding-spec.txt @@ -306,6 +306,9 @@ Table of Contents serves as a reasonable default regardless of implementation. - For all use cases, reduced padding clients use half the consensus value. + - Implementations MAY mark circuits held open past the reduced padding + quantity (half the consensus value) as "not to be used for streams", + to prevent their use from becoming a distinguisher. - Default: 1800
* nf_pad_before_usage