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In his landmark 1949 paper, Communication Theory of Secrecy Systems, Claude Shannon introduced the concept of...

In his landmark 1949 paper, Communication Theory of Secrecy Systems, Claude Shannon introduced the concept of product ciphers, which are based upon combining two basic methods of introducing randomness into the information being communicated. What are these methods?

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Answer #1

The two basic methods of introducing randomness into the information being communicated are-

  1. Product Operation:- In this system, the message is enciphered with the first secrecy system R and the cryptogram is enciphered with the second system S, the keys of R and S are selected independently.
  2. Weighted Addition:- This system is based on probabilities p and q. This probability defines a preliminary choice for the system R and S to be used with the probabilities p and q.
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