Decipher this message: YITJP GWJOW FAQTQXCSMA ETSOU SOAPU SQGKC PQTYJ using theH

Question

Decipher this message: YITJP GWJOW FAQTQXCSMA ETSOU SOAPU SQGKC PQTYJ using theHill cipher with the inverse key (5 1)                                                                                              (2 7) Show all calculations and the result. Thanks guys !!! Decipher this message: YITJP GWJOW FAQTQXCSMA ETSOU SOAPU SQGKC PQTYJ using theHill cipher with the inverse key (5 1)                                                                                              (2 7) Show all calculations and the result. Thanks guys !!!

Explanation / Answer

Let A =1, B=2... Z=26

P1 = 5(C1) + 1(C2)

P2 = 2(C1) + 7(C2) 5(Y) + 1(I)

     = 5(25) + 1(9)

    = 125 + 9

      =134 MOD 26

      = 4 = D 2(Y) +7(I)

      = 2(25) +7(9)

      = 50 + 63 =113 MOD26

     = 9

       = I 5(T) +1(J)

       = 5(20) +1(10)

      = 100 +10

        =110 MOD26

        =6

       = F 2(T) +7(J)

      = 2(20) +7(10)

       = 40 +70

        =110 MOD 26=

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