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The Look Ahead Note  Feb 11, 2009
 
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You can do this in a online chat by calculating the hash value (say md5) of what you think the person is about to say, publishing that hash value, and after they say it (if they do), showing them both earlier published hash value and the plain text that corresponds to it, thus proving that you've known in advance what are they going to say :]
3 years ago by celicni #50389