Pricing via Processing or Combatting Junk Mail.¶
Dwork, C., & Naor, M. (1993). Pricing via Processing or Combatting Junk Mail. Advances in Cryptology — CRYPTO '92.
Cited by¶
3 citations across 3 artifacts.
Each citation links to the sentence it supports in the citing article.
Primes¶
- Asymmetric Attack Defense Cost
- The durable interventions act on the Ratio or the Channel, exactly the prime's five moves. Lower defense cost via amortization: a single classifier trained once and applied to all messages changes the effective per-message ratio by the amortization factor. Lift attacker cost: sender-reputation systems and authentication (SPF, DKIM) raise the cost of sending from a trusted identity, and proof-of-work postage schemes impose a per-message computational tax that is trivial for a normal sender and prohibitive at spam volume.
This sourceIntroduces proof-of-work as a computational postage tax that is trivial for normal senders but prohibitive at bulk-email volume.
Supported in partVerified against the publisher's abstract
Source states the proof-of-work postage tax: a moderately hard per-use computation, trivial for normal senders and prohibitive in bulk. It does not mention SPF, DKIM, or amortization.
“We present a computational technique for combatting junk mail in particular and controlling access to a shared resource in general. The main idea is to require a user to compute a moderately hard, but not intractable, function in order to gain access to the resource, thus preventing frivolous use.”
- The durable interventions act on the Ratio or the Channel, exactly the prime's five moves. Lower defense cost via amortization: a single classifier trained once and applied to all messages changes the effective per-message ratio by the amortization factor. Lift attacker cost: sender-reputation systems and authentication (SPF, DKIM) raise the cost of sending from a trusted identity, and proof-of-work postage schemes impose a per-message computational tax that is trivial for a normal sender and prohibitive at spam volume.
Domain-specific¶
Mechanisms¶
- Rate-Limited Friction Escalation
- Escalating challenge cost is the same logic as a proof-of-work puzzle, which prices bulk abuse out while leaving a single request nearly free.
This sourceIntroduces computational pricing that requires moderately hard work for each request to make large-scale junk mailing costly.
- Escalating challenge cost is the same logic as a proof-of-work puzzle, which prices bulk abuse out while leaving a single request nearly free.
Verification¶
Does it exist? Confirmed. This work's DOI resolves to a registered record, which fixes its identity. That is all it fixes.
Does it back the claim? Read against the text for 1 of 3 citations: 1 supported in part. Each verdict is shown under its citation below, with what in the work backs the sentence.
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