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iii. Suppose that you encrypted three blocks of messages M1,M2,M3 using INC and received
ciphertexts C1,C2,C3. If C3 was corrupted, which of the three message blocks will be decrypted
incorrectly? Explain your answer. iv. Show that INC is an NOT an IND-CPA secure method.
That is, provide two multi-block messages M0 and M1 chosen by an IND-CPA attacker and
show how this attacker, given either C0 or C1, can determine which message was encrypted by
the challenger. Explain the attacker's strategy precisely.

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iii. Suppose that you encrypted three blocks of messages M1,M2,M3 usi.pdf

  • 1. iii. Suppose that you encrypted three blocks of messages M1,M2,M3 using INC and received ciphertexts C1,C2,C3. If C3 was corrupted, which of the three message blocks will be decrypted incorrectly? Explain your answer. iv. Show that INC is an NOT an IND-CPA secure method. That is, provide two multi-block messages M0 and M1 chosen by an IND-CPA attacker and show how this attacker, given either C0 or C1, can determine which message was encrypted by the challenger. Explain the attacker's strategy precisely.