Decrypting A Cyphertext C

• Divide Cs by n. D(C) is the remainder.

  C = 17, n = 55, s = 27
  
  1727 = 1,667,711,322,168,688,287,513,535,727,415,473
  = 30,322,024,039,430,696,136,609,740,498,463 × 55 + 8
  D(17) = 8

• Translate D(C) into letters.

  H
  

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