“I hate e-mail,” John says. Harvard Li stares him in the eye for a while. “What do you mean?” “The concept is good. The execution is poor. People don’t observe any security precautions. A message arrives claiming to be from Harvard Li, they believe it’s really from Harvard Li. But this message is just a pattern of magnetized spots on a spinning disk somewhere. Anyone could forge it.” “Ah. You use digital signature algorithm.” John considers this carefully. “I do not respond to any e-mail that is not digitally signed. Digital signature algorithm refers to one technique for signing them. It is a
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