Question

Perform encryption and decryption for the RSA algorithm using
these parameters: p = 13; q = 19; e = 5;

Plaintext should be the first three letters of the month you were
born (convert letters to the values 0-25). Note you need to do
three encryptions. Show how decryption works.

The above calculation is performing a cipher on the alphabet. How
does this method compare with a classic cipher?

Answer #1

**M**
for the birth month MAY

Similarly we can proceed for further(3-times) for the other
3-alphabets

Alice is sending message “HIDE” to Bob. Perform encryption and
decryption using RSA algorithm, with the following information:
Parameters p q e 11 5 7 Present all the information that you will
need to encrypt and decrypt only the first letter from text.

RSA Cryptography
Perform encryption and decryption to find private decryption key
d.
a. p = 3, q = 13, e = 7
b. p = 787, q = 631, e = 234559

Perform encryption using the RSA algorithm for the
following:
p=5, q=9, e=2, M=5
p=4, q=12, e=4, M=3
C=Me mod n
C is the cipher text and M is the plain text, n=p×q

Let p=11, q=17, n = pq = 187. Your (awful) public RSA encryption
key is (e=107, n=187). (a) What is your private decryption key? (b)
You receive the encrypted message: 100 Decrypt the message. (In
other words, what was the original message, before it was
encrypted? Just give me a number, don’t convert it to letters).

Vigenère Cipher. In the Vigenère Cipher, we use a special
keyword to encrypt a message. We represent each letter of the
alphabet as a number from 0-25. In order, we add each letter from
the keyword to the message and mod by 26. If the keyword is shorter
than the message, we simply repeat the keyword. For example, lets
say that the message is HOWSTUFFWORKS and the keyword is CIPHER.
The following table shows how we can find the final...

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