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The message itself could be sent over an open channel; an eavesdropper would not be able to understand the message without the key. Of course, the key can be used only once. A clever eavesdropper Page 30 could detect patterns in the messages if the same key is used over and over, possibly helping to break the code. So to be perfectly safe, a key needs to be discarded after use. ) The remaining problem is how to share the secret key. A floppy disk filled with random bits works pretty well, if Alice and Bob can first meet face-to-face for a disk exchange.
But by the 1993 meeting in Seattle, it seemed more likely that quantum mechanics permitted doing things that nobody thought possible outside the realm of cinematic special effects. So I asked Bennett there whether quantum physics held other surprises in store. "I would guess there are probably a few more surprises," he said. "The quantum mechanics that we've had around for all these years is a very strange and beautiful theory that appears to describe our world in a very accurate way. " 7 He was right.
The Analytical Engine weaves algebraical Page 50 patterns just as the Jacquard loom weaves flowers and leaves," Ada wrote. 10 Of course, Babbage's Analytical Engine was never built. Some parts of it were made, but Babbage kept thinking up new ways of doing things that prevented progress. Furthermore, other people were coming up with good new mathematical ideas that Babbage wanted to incorporate in his machine. Especially striking was a new way of representing logical propositions mathematically, just the sort of thing that an all-purpose computer needed.