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RSA cryptosystem
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===Key distribution=== Suppose that [[Alice and Bob|Bob]] wants to send information to [[Alice and Bob|Alice]]. If they decide to use RSA, Bob must know Alice's public key to encrypt the message, and Alice must use her private key to decrypt the message. To enable Bob to send his encrypted messages, Alice transmits her public key {{math|(''n'', ''e'')}} to Bob via a reliable, but not necessarily secret, route. Alice's private key {{math|(''d'')}} is never distributed.
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