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Re: hashcash spam prevention & firewalls
At 5:55 PM +0000 12/22/1997, Adam Back wrote:
>Bill Stewart <[email protected]> writes:
>> >This is exactly what I was addressing: remailers only have to get
>> >themselves certified as remailers and then prove their certification
>> >to the destination
>>
>> You're both taking the wrong approach - make the originator of the
>> message generate the hashcash, and make sure the remailer syntax
>> lets them paste it in as needed. For chained remailers, generate
>> multiple layers of hashcash. Maintaining whitelists is a losing
>> game, but unnecessary here.
>
>This works well enough.
>
>The more thorny problem to solve is that posed by Robert Costner: what
>do you do about nyms. You (the sender) can't include postage for nym
>reply blocks because you don't know (and mustn't know) the remailer
>chain pointed to by the reply block.
eCache is probably the best solution for remailers (and probably SPAM in general) since real value can pass anonymously from sender to receptient.
>
>> Mailing lists are still hard, and perhaps best handled by the user's
>> software (or some fancy variant like user-selectable filters at the
>> ISP mailbox.)
>
>I think it's simplest to have the user explicitly allow the mailing
>list.
Yes, especially when the list requires a hashcash 'initiation,' before allowing unlimited postings, to prevent many common list SPAM abuses.
--Steve