Microsoft Research: The Penny Black Project
Microsoft Research:
The Penny Black Project
“The introduction of the Penny Black stamp played an important role in the reform of the British Postal System during the 1830’s. Before this time, postage fees were based on weight and on distance involved. Postage had to be calculated for each letter, and was typically paid by the addressee. The introduction of the Penny Black shifted the cost of postage to the sender and eliminated the complexity of postage computation by requiring a uniform, low rate. … The Penny Black project is investigating several techniques to reduce spam by making the sender pay. We’re considering several currencies for payment: CPU cycles, memory cycles, Turing tests (proof that a human was involved), and plain old cash. There are multiple system organizations that can support this: senders can pre-compute the appropriate function, tied to a particular message; senders can come up with the payment in response to a challenge after they’ve submitted their message; senders can acquire a ticket pre-authorizing the message. Recipients would aggressively white-list good senders.”
