[Asrg] Re: 3. Proof-of-work analysis
Philip Miller <millenix@zemos.net> Wed, 19 May 2004 22:51 UTC
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From: Philip Miller <millenix@zemos.net>
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References: <LV1hjGBSmTqAFAry@highwayman.com> <CB27C1AA-A8AB-11D8-B336-000393863768@chromatix.demon.co.uk> <mevaB4e60fqAFAu2@highwayman.com> <03A0F711-A929-11D8-B336-000393863768@chromatix.demon.co.uk> <j8075egWYyqAFA8T@highwayman.com>
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Subject: [Asrg] Re: 3. Proof-of-work analysis
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Date: Wed, 19 May 2004 18:10:01 -0400
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Richard Clayton wrote: > In article <03A0F711-A929-11D8-B336-000393863768@chromatix.demon.co.uk>, > Jonathan Morton <chromi@chromatix.demon.co.uk> writes > >>That leaves one big category: Web Mail. The likes of Hotmail and >>Yahoo don't charge for sending e-mail from their systems, except >>perhaps in terms of banner ads. They also handle ginormous amounts of >>said mail, which could make a proof-of-work switch-on relatively >>difficult for them. However, most of their clients are low-end home >>users, who, on average, may have relatively favourable contact >>patterns. For this, we could do with more statistics. > > Goodman & Rounthwaite have an interesting paper on using Captchas to > limit webmail usage (one conclusion is that you need quite a number of > them). It was presented at EC'04 yesterday, but the link on Joshua's > home page is not currently working -- I expect he'll fix it when he gets > home :( In addition to the favorable contact patterns, webmail providers have other options (that are not particularly restricted to webmail providers): 1. Ask/require their customers to download a small applet that would do the work on the client machine (obviously doesn't work when the client is something like an underpowered cell phone with WAP access) 2. Tell customers that mail delivery may be delayed unless they pay for service while the provider does the proof-of-work as cycles are available 3. Rate-limit customers both by login ID and by client host address or other identifying info If proof-of-work were implemented and demanded on a large (Internet) scale, I don't think webmail providers would suffer as much as they would appear to on the surface. I'd also like to note that any of these methods could be used by webmail providers to limit spam sent through their systems regardless of any receiving-end demand for proof-of-work. Philip Miller _______________________________________________ Asrg mailing list Asrg@ietf.org https://www1.ietf.org/mailman/listinfo/asrg
- [Asrg] 3. Proof-of-work analysis Richard Clayton
- Re: [Asrg] 3. Proof-of-work analysis Barry Shein
- Re: [Asrg] 3. Proof-of-work analysis Seth Breidbart
- Re: [Asrg] 3. Proof-of-work analysis der Mouse
- RE: [Asrg] 3. Proof-of-work analysis Hallam-Baker, Phillip
- Re: [Asrg] 3. Proof-of-work analysis Seth Breidbart
- Re: [Asrg] 3. Proof-of-work analysis Jonathan Morton
- Re: [Asrg] 3. Proof-of-work analysis der Mouse
- Re: [Asrg] 3. Proof-of-work analysis Alan DeKok
- Re: [Asrg] 3. Proof-of-work analysis Richard Clayton
- Re: [Asrg] 3. Proof-of-work analysis Alan DeKok
- Re: [Asrg] 3. Proof-of-work analysis der Mouse
- Re: [Asrg] 3. Proof-of-work analysis Jonathan Morton
- RE: [Asrg] 3. Proof-of-work analysis grsa
- RE: [Asrg] 3. Proof-of-work analysis Bill Cole
- Don't blame the list, blame me (was RE: [Asrg] 3.… Bill Cole
- RE: [Asrg] 3. Proof-of-work analysis Bill Cole
- [Asrg] Re: 3. Proof-of-work analysis Adam Back
- Re: [Asrg] 3. Proof-of-work analysis Richard Clayton
- [Asrg] Re: 3. Proof-of-work analysis Adam Back
- Re: [Asrg] 3. Proof-of-work analysis Tony Finch
- Re: [Asrg] 3. Proof-of-work analysis Seth Breidbart
- Re: [Asrg] Re: 3. Proof-of-work analysis Jonathan Morton
- Re: [Asrg] Re: 3. Proof-of-work analysis Barry Shein
- Re: [Asrg] 3. Proof-of-work analysis Jonathan Morton
- [Asrg] Re: 3. Proof-of-work analysis Philip Miller
- Re: [Asrg] 3. Proof-of-work analysis Jon Kyme
- Re: [Asrg] Re: 3. Proof-of-work analysis Mark Baugher
- [Asrg] Re: 3. Proof-of-work analysis Adam Back
- Re: [Asrg] 3. Proof-of-work analysis Richard Clayton
- Re: [Asrg] Re: 3. About hashcash v1 (was: Proof-o… Jonathan Morton
- [Asrg] Re: 3. Proof-of-work analysis Adam Back
- Re: [Asrg] Re: 3. Proof-of-work analysis william(at)elan.net
- Re: [Asrg] Re: 3. Proof-of-work analysis Richard Clayton
- Re: [Asrg] Re: 3. Proof-of-work analysis Richard Clayton
- Re: [Asrg] Re: 3. Proof-of-work analysis william(at)elan.net