1.1 Secure Communications
In the basic communication scenario, depicted in Figure 1.1, there are two parties, we’ll call them Alice and Bob, who want to communicate with each other. A third party, Eve, is a potential eavesdropper.
Figure 1.1 The Basic Communication Scenario for Cryptography.
When Alice wants to send a message, called the plaintext, to Bob, she encrypts it using a method prearranged with Bob. Usually, the encryption method is assumed to be known to Eve; what keeps the message secret is a key. When Bob receives the encrypted message, called the ciphertext, he changes it back to the plaintext using ...
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