Question: Use substitution cipher with k=8 to encrypt the following string: Four score and seven years ago our fathers brought forth on this continent a new

Use substitution cipher with k=8 to encrypt the following string:

Four score and seven years ago our fathers brought forth on this continent a new nation conceived in Liberty and dedicated to the proposition that all men are created equal.

(For this problem, ignore the whitespaces (i.e., no need to encrypt the spaces, just encrypt the text of the above sentence)).

Decrypt the following ciphertext which was encrypted with substitution cipher.

F xynyhm ns ynrj xfajx snsj.

Assume that the value of k can be between 0 and 10.

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