PAYLOAD_LEN bug in spec?

Mike Perry mikepery at
Wed Jan 3 04:46:27 UTC 2007

Thus spake chris at (chris at

> On Sun, Dec 31, 2006 at 02:08:34PM -0500, Nick Mathewson wrote:
> >
> > Thanks, good catch!
> I'm glad you appreciate my posts.  I was afraid of how my emails
> would be taken by the Tor group.  I'm glad it seems they are well
> received.  I'll try to keep you posted on useful info I find about
> the spec.

Yes, please also release early and release often. I'm very interested
in the ability to mess around with Tor circuits easily by dupping
cells, modifying fields, and so on to look for side channels and other
ways to watermark circuits (and develop scanning mechanisms to detect
this, of course). A python implementation is likely to be a lot more
fungible to this type of stuff than the C one is.

Mike Perry
Mad Computer Scientist evil labs

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