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30 September, 08:46

A polyalphabetic cipher uses many ___

a) keys

b) transpositions

c) codes

d) monoalphabetic substitution rules

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Answers (1)
  1. 30 September, 10:55
    0
    Answer:d) Mono-alphabetic substitution rules

    Explanation: Poly-alphabetic cipher is the cryptography that is done by using the many alphabets in substitutional way. They are supposed to have a good security because they use cipher text alphabets for the encryption and then decrypts it.

    Substitution of the alphabets is done by the rule of the mono-alphabetic substitution rules. Other given options are incorrect because they are not used in the cryptography of the alphabetic cipher. Thus option (d) is the correct answer.
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