Encrypting a Message

• Break the message into chunks.

  H I C H R I S …
  

• Translate each chunk into an integer M (0 < M < n).

  8 9 3 8 18 9 19 …
  

• Divide M3 by n. E(M) is the remainder.

  M = 8, n = 55
  
  83 = 512 = 9×55 + 17
  E(8) = 17

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