Opened 13 years ago

Closed 17 months ago

#492 closed enhancement (wontfix)

Generation of dummy messages

Reported by: tcr Owned by:
Priority: Low Milestone:
Component: Mixminion-Other Version: unspeficied
Severity: Normal Keywords:
Cc: tcr Actual Points:
Parent ID: Points:
Reviewer: Sponsor:


For an increase in cover traffic mixminion should automatically generate
dummy messages, similar to mixmaster's INDUMMYP and OUTDUMMYP.

[Automatically added by flyspray2trac: Operating System: All]

Child Tickets

Change History (4)

comment:1 Changed 13 years ago by nickm

Is there any evidence that these automatically generated dummies actually improve anonymity?
The experimental results in "Practical Traffic Analysis: Extending and Resisting Statistical Disclosure"
(Mathewson and Dingledine, 2004) suggests that they actually don't help against traffic analysis.

On the other hand, if someone wants to hack this in, they should look at the link padding code in,
or possibly add some logic to the getBatch() code in

comment:2 Changed 13 years ago by tcr

Thanks for your hint, didn't know about the paper before.

I've read the paper and got your point. I'd even say, as long as dummy
messages are created within the mix network and do not leave it, an
attack as described in your paper does not (have to) care about them.
Therefore I'd myself suggest discarding this feature request.

As pointed out in the paper, spreading out possible exit times for
messages is essential. So what about letting the sender specify a
minimum latency for each mix?

I don't know if this is really sensible, but with probabilistic mixing
there could be a weighting factor per message for the probability that
the message will be chosen at each mix intervall, specified by the
sender and with default one.
Messages with lower weights would be expected to stay in the pool for
linearly longer time, not just a fixed offset.

comment:3 Changed 3 years ago by teor

Severity: Normal

Set all open tickets without a severity to "Normal"

comment:4 Changed 17 months ago by nickm

Resolution: Nonewontfix
Status: newclosed

Mixminion development is not happening any more.

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