[Standards-JIG] privacy2 anti-SPIM proto-JEP

Jacek Konieczny jajcus at jajcus.net
Tue Aug 30 20:22:39 UTC 2005

On Tue, Aug 30, 2005 at 10:06:46PM +0200, Bart van Bragt wrote:
> Systems like this already exist in the email world and aren't exactly 
> popular (try a Google search on 'challenge response email spam', I have 
> to admit that quite a few of the problems with these systems are not 
> valid if the system is implemented on XMPP).

For email, a challenge-response systems are a _very_bad_idea_, as the
sender addresses on spam and viruses (i.e. most of the mail) are usually
forged and the challenge goes to and annoys random user. With XMPP we
don't have such problems, as even the old, good diallback solves it.


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