ElGamal is an asymmetric algorithm that can be used for both digital signatures and general encryption. Question 39 options: True False
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Step 1: ElGamal is indeed an asymmetric algorithm that can be used for both digital signatures and general encryption. Show more…
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Prove that the following are true or False. Show working. 11. a. Using the prime p = 521 Alice and Bob have exchanged the Diffie- Hellman key z = 127. Alice receives the encrypted message y = 99 from Bob. The message that she decrypts is x = 267. b. Alice and Bob agree to use the prime p = 8011 and the primitive root g = 51. (They verified that p is prime and that g is primitive for p.) Alice chooses the secret discrete logarithm `L = 1985. Bob chooses the secret discrete logarithm k = 6703, The Diffie- Hellman key that they exchange is z = 7554.
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[Cryptography] Consider two messages each of n blocks m_i: M_1 = m_1||m_2|| ... ||m_n and M_2 = m_1'||m_2|| ... ||m_n, where M_1 and M_2 differ only in the first block. Which of the following statements hold? Assume the same key is used for all encryption. a) If M_1 and M_2 are encrypted using electronic code book mode (ECB), none of the ciphertext blocks will repeat between each message. (CIRCLE the correct answer and give the reason)
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