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:
“I had not given a penny for a song
Did not the poet sing it with such airs
That one believed he had a sword upstairs;
Yet would be now, could I but have my wish,
Colder and dumber and deafer than a fish.”
—William Butler Yeats (1865–1939)
“A little black thing among the snow
Crying “’weep, ‘weep,” in notes of woe!
“Where are thy father & mother? say?”
“They are both gone up to the church to pray.”
—William Blake (1757–1827)