Chapter 9 The RSA Algorithm
9.1 The RSA Algorithm
Alice wants to send a message to Bob, but they have not had previous contact and they do not want to take the time to send a courier with a key. Therefore, all information that Alice sends to Bob will potentially be obtained by the evil observer Eve. However, it is still possible for a message to be sent in such a way that Bob can read it but Eve cannot.
With all the previously discussed methods, this would be impossible. Alice would have to send a key, which Eve would intercept. She could then decrypt all subsequent messages. The possibility of the present scheme, called a public key cryptosystem, was first publicly suggested by Diffie and Hellman in their classic 1976 paper [Diffie-Hellman]. ...
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