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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. ==Objective== As internet email is becoming increasingly popular, spam begins to become a larger problem. It costs the recipient loss of bandwidth, time, and productivity. The Penny Black Project is a Microsoft Research project that tries to fight spam. Like the Penny Black stamp the project was named after, the attempt is to move the costs from the receiver to the sender. The general idea is that if a stranger is sending you mail, they must prove that they have expended a certain amount of effort specifically for you and the message alone. The project aims to have little impact with a low number of recipients while being able to charge spammers in a way such that it is no longer profitable. Research is focused on charging spammers in computing time. Doing this, would be able to limit only several emails to be sent in a minute. This would barely affect an average user, but spammers would be required to have many more computers to send spam efficiently. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Penny Black (research project)」の詳細全文を読む スポンサード リンク
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