Penny Black (research Project)

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 black and/or penny:

    That’s the down-town frieze,
    Principally the church steeple,
    A black line beside a white line;
    And the stack of the electric plant,
    A black line drawn on flat air.
    Wallace Stevens (1879–1955)

    Socialized medicine, some still cry, but it’s long been socialized, with those covered paying for those who are underinsured. American medicine is simply socialized badly, penny wise and pound foolish.
    Anna Quindlen (b. 1952)