COMPUTER ETHICS AND SECURITY
CRYPTOGRAPHY AND ENCRYPTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Suppose an RSA cryptosystem is used to send the plaintext “4” with public key (n, e) = (33, 3). What is the cipher text that corresponds to the message “4”?
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43mod33
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31
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34mod33
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28
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34mod31
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Explanation:
Detailed explanation-1: -The Caesar Cipher is a monoalphabetic rotation cipher used by Gaius Julius Caesar. Caesar rotated each letter of the plaintext forward three times to encrypt, so that A became D, B became E, etc., as shown in Table 4.6.
Detailed explanation-2: -To encrypt a plaintext M using an RSA public key we simply represent the plaintext as a number between 0 and N-1 and then compute the ciphertext C as: C = Me mod N.
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