Modify your cipher.html page from Exercise 15.15 so that it implements a rotating substitution cipher. [This should
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Modify your cipher.html page from Exercise 15.15 so that it implements a rotating substitution cipher.
[This should require only minimal changes to the code. After each character in the message has been encoded/decoded, your Rotate function (from Exercise 15.4) should be called to rotate the key.]
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