A Conversation with Edward Snowden (Part 1)
StarTalk Radio
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The Importance of Encryption in Communication
A perfectly encrypted message is actually indistinguishable from the noise, because then you wouldn't even know to intercept it. In theory, for example, there's an old method of encryption called a one-time pad. It could just as well be another message that has the same number of letters as my name is Neil deGrasse Tyson. If aliens want to communicate with us, they would find a pretty efficient way to send a signal to reduce the energy cost for them.
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