[Server-devel] Apache proxy CRCsync & mozilla gsoc project?

Toby Collett thjc at plan9.net.nz
Tue Mar 31 15:10:50 EDT 2009

The plan was to include something like an sha1 hash of the original file in
the response headers. Then once the file has been decoded you can check to
make sure it matches. If not you can resend the request without the black
hash header and get the file the oldfashioned way.


2009/4/1 Martin Langhoff <martin.langhoff at gmail.com>

> On Tue, Mar 31, 2009 at 8:32 PM, Toby Collett <thjc at plan9.net.nz> wrote:
> > We are only using 30 bit hashes, so even if it was a perfect hash it is
> > possible you could get a collision. Having said that our collision space
> is
> > only the single web request, so should reduce chances of error.
> IIRC, if rsync thinks there was a collision on the weak hash, it rolls
> again through the file with the weak hash and a different seed.
> Maybe we could include a differently seeded fingerprint?
> Is that what you were thinking?
> cheers,
> m
> --
>  martin.langhoff at gmail.com
>  martin at laptop.org -- School Server Architect
>  - ask interesting questions
>  - don't get distracted with shiny stuff  - working code first
>  - http://wiki.laptop.org/go/User:Martinlanghoff

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