On Mon, 9 Feb 2004, Justin Mason wrote:
> The proof-of-work part is taking
>> Recipient: jm at jmason.org | SOMEDATA
>> and coming up with a value of SOMEDATA that hashes to
> 0x000000abcfe3234...etc. , where the first N bits are 0.
> Iteration is the current way to do this; SOMEDATA=1, SOMEDATA=2,
Aha. This is presumably the same hashcash as at:
Very very interesting :)
The draft RFC would need a bit more work, to bring it to the same
high standard of his other papers on Hashcash. Perhaps he
deliberately did not finalise the details though.
> Yeah -- that's labour-intensive for the recipient.
Not really though. At least, my MUA has long been configured with a
list of my email addresses, so that it can distinguish my address(es)
from others (eg, to allow display of the 'To:' field rather than the
'From:', should the 'From:' field be "me" and hence not useful.).
Nearly all MUAs know the user's email, it's just a matter of them
being able to know more than one.
> Or accept hashcash for those lists. Consider ILUG -- lots of spam
> relayed by list.
Yep. The initial sender would include 2 hashcash's, one for list, one
the direct recipient.
The list software shouldnt generate a hashcash. (its just too
> Yep, but unless the recipient addr is accepted by the recipient, it
> won't do any good.
> > Another thing that's missing is that the cookie will need to have
> > a have a message digest or even a full cryptographic signature of
> > the message body inside it, otherwise cookies could be reused.
>> .... and that's the hard part ;)
Difficult for hashcash.
> Seriously -- this has come up before, and if you leave out some bit
> of the user-visible data (From, To, Subject, body) then you give
> spammers a space to write their message in.
> And then you have to deal with list servers that scribble on the
> rest of the data, adding message footers or subject line tags,
> screwing up that hash ;)
Right, hence why you might make use of mime.
Paul Jakma paul at clubi.iepaul at jakma.org Key ID: 64A2FF6A
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