spf-discuss
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body hashing (was Re: cost comparison of Caller-ID, DK, and SPF)

2004-02-25 12:04:55
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David Woodhouse writes:
On Wed, 2004-02-25 at 09:59 -0800, Justin Mason wrote:
This added because DK hashes the message body, and some mailing list
software (MailMan for example, or this list) modifies the body, 
which will cause DK failures.

Mailing lists don't mangle the body _much_ though.
Imagine a scheme where you generate and sign a tuple of

{ <number of original lines>, <cheap rolling checksum>, <hash> }

What's being proposed doesn't do that, though.

I agree, a well-thought-out scheme to do that would be useful,
as long as the "single URL replay attack" is dealt with.

- --j.
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