This definition appears somewhat frequently
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The Sender ID Framework is a protocol created to counter e-mail domain spoofing and to provide greater protection against phishing schemes by verifying an e-mail message's sender.
A way to visualize a commitment scheme is to think of a sender as putting a message in a locked box, and giving the box to a receiver. The message in the box is hidden from the receiver, who cannot open the lock themselves. Since the receiver has the box, the message inside cannot be changed—merely revealed if the sender chooses to give them the key at some later time.