Question: Consider the following mapping A B C D E F G H I J K L M N O P Q R S T U

Consider the following mapping
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
012345678910111213141516171819202122232425
Can the function f (x)= xk (mod 26) be used as a cipher where k >1 is the key and x is a letter
to be encrypted? Justify your answer.

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