The Penny Black Project is a Microsoft Research project that tries to find effective and practical ways of fighting spam. Because identifying spams consumes a recipient's time, the idea is to make the sender of emails "pay" a certain amount for sending them. The currency or the mode of payment could be CPU cycles, Turing tests or memory cycles. Such a payment would limit spammers' ability to send out large quantities of emails quickly.
The project's name is derived from the Penny Black, the world's first adhesive stamp used for pre-paid postage.
Famous quotes containing the words penny and/or black:
“There is no passion more dominant and instinctive in the human spirit than the need of the country to which one belongs.... The time comes when nothing in the world is so important as a breath of one’s own particular climate. If it were one’s last penny it would be used for that return passage.”
—Gertrude Stein (1874–1946)
“Thou art a beaten dog beneath the hail,
A swollen magpie in a fitful sun,
Half black half white
Nor knowst’ou wing from tail
Pull down thy vanity
How mean thy hates”
—Ezra Pound (1885–1972)