[foaf-dev] [Fwd: [FriendFeed] Re: FOAF tweaks]
richard at cyganiak.de
Fri May 9 15:01:25 BST 2008
On 9 May 2008, at 13:39, Julian Bond wrote:
> So basically, I just don't see a significant security issue with
> including mbox_sha1sum. YMMV.
Let's say Bob has an account at site X and another account at site Y.
He wants to keep the identities distinct; one might be about his work
life and the other might be related to his online gaming identity and
he doesn't want smushing between them. If site X and site Y both say:
“We will never, ever publish your email address”, then he might feel
fine about using the same email address in both places.
Now, if sites X and Y publish hashes of users' email addresses, it
becomes possible to smush Bob's two identities, and discover Bob Smith
on site X is TheReaper83 on site Y. This will violate Bob's
expectations, and he might feel betrayed by the sites.
That's the security issue.
mbox_sha1sum is like an “identity fingerprint” that can be tracked
across the Web. Users will be surprised that sites publish such a
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