Computer Science / CS 0632 · Atom · ~20 seconds
Cryptography's Cast
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Cryptography's components are a fixed cast: plaintext needing protection, an encryption algorithm and key producing ciphertext, a decryption algorithm and key restoring plaintext for the receiver.
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A message crossing a hostile wire unreadable, then readable again at home, used every member.
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The Unit 3 deferral lands here — cryptography's course home is this strand.