CentMail: Rate Limiting via Certified Micro-Donations
msra(2009)
摘要
We present a plausible path toward adoption of email postage stamps|an oft-cited method for ghting spam| along with a protocol and a prototype implementation. In the standard approach, neither senders nor recipients gain by joining unilaterally, and senders lose money. Our sys- tem, called CentMail, begins as a charity fund-raising tool: Users donate $0.01 to a charity of their choice for each email they send. The user benets by helping a cause, promot- ing it to friends, and potentially attracting matching dona- tions, often at no additional cost beyond what they planned to donate anyway. Charitable organizations benet and so may appeal to their members to join. The sender's email client certies each outgoing message with an unforgeable stamp issued by the CentMail server. The recipient's email client veries with CentMail that messages are appropri- ately stamped, and have not been queried by an unexpect- edly large number of other recipients. More generally, the system can serve to rate-limit and validate many types of transactions, broadly construed, from weblog comments to web links to account creation.
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rate limiting
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