Re: [camram-spam] Re: Microsoft publicly announces Penny Black PoW postage project

2004-01-02 Thread Alan Brown
On Tue, 30 Dec 2003, Bill Stewart wrote: The reason it's partly a cryptographic problem is forgeries. Once everybody starts whitelisting, spammers are going to start forging headers to pretend to come from big mailing lists and popular machines and authors, so now you'll not only need to

Re: [camram-spam] Re: Microsoft publicly announces Penny Black PoW postage project

2003-12-31 Thread R. A. Hettinga
At 7:46 PM + 12/30/03, Richard Clayton wrote: where does our esteemed moderator get _his_ stamps from ? A whitelist for my friends, etc... Whitelist [EMAIL PROTECTED] Cheers, RAH -- - R. A. Hettinga mailto: [EMAIL PROTECTED] The Internet Bearer Underwriting Corporation

Re: [camram-spam] Re: Microsoft publicly announces Penny Black PoW postage project

2003-12-31 Thread Bill Stewart
At 07:46 PM 12/30/2003 +, Richard Clayton [EMAIL PROTECTED] wrote: [what about mailing lists] Obviously you'd have to whitelist anybody's list you're joining if you don't want your spam filters to robo-discard it. moan I never understand why people think spam is a technical problem :( let

Re: [camram-spam] Re: Microsoft publicly announces Penny Black PoW postage project

2003-12-31 Thread jal
On Tue, 30 Dec 2003, Bill Stewart wrote: At 07:46 PM 12/30/2003 +, Richard Clayton [EMAIL PROTECTED] wrote: [what about mailing lists] Obviously you'd have to whitelist anybody's list you're joining if you don't want your spam filters to robo-discard it. moan I never understand why

Re: [camram-spam] Re: Microsoft publicly announces Penny Black PoW postage project

2003-12-31 Thread Ben Laurie
Richard Clayton wrote: and in these schemes, where does our esteemed moderator get _his_ stamps from ? remember that not all bulk email is spam by any means... or do we end up with whitelists all over the place and the focus of attacks moves to the ingress to the mailing lists :( He uses the

Re: [camram-spam] Re: Microsoft publicly announces Penny Black PoW postage project

2003-12-30 Thread Eric S. Johansson
Scott Nelson wrote: d*b --- s where: d = stamp delay in seconds s = spam size in bytes b = bandwidth in bytes per second I don't understand this equation at all. It's the rate limiting factor that counts, not a combination of stamp speed + bandwidth. well, stamp speed is method of

Re: [camram-spam] Re: Microsoft publicly announces Penny Black PoW postage project

2003-12-30 Thread Alan Brown
On Tue, 30 Dec 2003, Eric S. Johansson wrote: But using your spam size, , the slowdown factor becomes roughly 73 times. So they would need 73 machines running full tilt all the time to regain their old throughput. Believe me, the professionals have enough 0wned machines that this is

Re: [camram-spam] Re: Microsoft publicly announces Penny Black PoW postage project

2003-12-30 Thread Jerrold Leichter
(The use of memory speed leads to an interesting notion: Functions that are designed to be differentially expensive on different kinds of fielded hardware. On a theoretical basis, of course, all hardware is interchangeable; but in practice, something differentially expensive to calculate on an

Re: [camram-spam] Re: Microsoft publicly announces Penny Black PoW postage project

2003-12-30 Thread Richard Clayton
On Tue, 30 Dec 2003, Eric S. Johansson wrote: But using your spam size, , the slowdown factor becomes roughly 73 times. So they would need 73 machines running full tilt all the time to regain their old throughput. Believe me, the professionals have enough 0wned machines that this is