shift cipher is one the simplesgt cipher
here each alphabet are assigned with the numerical value starting from a wth 0 anb b with 2 ............ z= 25.
so
f(p) =(p+17) mod 26means each numbers should be icremented by 17 and mod 26 is caluculated
w= 22 ,
f(p)=22+17 =39 mod 26= 13= n
similarly we get
NRCUVE as encrpted message
QUESTION 9 Encrypt the message WALDEN using a shift cipher with f(p (p+17) mod 26
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