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Math Help - Help finding the decryptor

  1. #1
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    Help finding the decryptor

    If Z(w) is equivalent to 21w+12 and this is an encryptor, then how would I find the decryptor?

    I know the decryption law is w=A^(-1) * (Z-B) (mod N) where A^(-1) is the multiplicative inverse.

    The encryption law is E(w) is equivalent to Aw + B (mod N)
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  2. #2
    MHF Contributor chisigma's Avatar
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    Under the hypothesis that N=26 , if A=21 then 21 \cdot 5= 105 = 1 \mod 26 \rightarrow A^{-1}=5, so that the decription law will be...

     w= 5 \cdot (Z-12) \mod 26 (1)

    Kind regards

    \chi \sigma
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