In 19-24, use the RSA cipher from Examples 8.4.9 and 8.4.10. In 19-21, teranslate the message into its numeric equivalent and encrypt it. In 22-24, decrypt the ciphertext and translate the result in to letters of the alphabet to discover the message.
Write the message into its numeric and encrypt it.
The given message is “WELCOME”.
Let be an integer and be a positive integer. Then, there are unique integers with such that , here, is the quotient and is the remainder.
So, and .
RSA Cipher Work:
The formula of the RSA cryptography is .
The numeric values of the letters WELCOME are:
To encrypt the letters, use the formula …… (1)
Where, and .
To encrypt , substitute for in the equation (1).
To encrypt , substitute 5 for in the equation (1)
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