[hashcash] Re: hashcash for camram-spam list? (Re: [camram-spam]Re: Friday news)

Ben Laurie wrote:

> Adam Back wrote:
> 
>>I notice this msg turned up days later, presumably because the
>>moderator had to approve it because I sent from a shell account with
>>mutt (so that it has 'From adam@xxxxxxx' but From: adam@xxxxxxxxxxxxxxx).
>>
>>This is an anti-spam measure; perhaps we could tweak the mail list
>>software so it allows posts with hashcash for the list address (such
>>as this one with a hashcash for camram-spam@xxxxxxxxxx).
>>
>>This is one of the major things hashcash is for after all, and the
>>list is promoting use of the same ;-)
> 
> 
> Excellent plan - its a mailman list, and I've already been disappointed 
> by my attempt to get PGP into mailman, but perhaps I could be persuaded 
> to try again...

I would be careful about this.  Allowing any address in based on a stamp 
effectively devalues the stamp.  In other words, for a given amount of 
effort, you can reach more people.  This is where the signature basedif 
stamps we have been dancing around would shine.

If on the other hand, you use something like hmac-sha1, with a secret 
key you provide the mailing list when you sign out, then maybe, just 
maybe it would be OK.  However, this would be only useful for mailing 
lists and not generalized to all communications.

---eric

Other related posts: