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3.(a) If a cipher is IND-CCA, it must be IND-CPA. True or false? (b) Assuming that there are 668 users in the crypto system, and

3.(a) If a cipher is IND-CCA, it must be IND-CPA. True or false?

(b) Assuming that there are 668 users in the crypto system, and they use OTP to achieve perfectly secure communication with each other. How many secret keys does each user need?

(c) Assuming that there are 220 users in the crypto system, and they use OTP to achieve perfectly secure communication with each other. How many secret keys does the system need to manage?

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