# Foundations of Cryptography | NPTEL | Week 11 Assignment Solutions

This set of MCQ(multiple choice questions) focuses on the Foundations of Cryptography NPTEL Week 11 Assignment Solutions.

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### Foundations of Cryptography NPTEL Week 11 Assignment Solutions

Q1. Which of the following statement(s) is/are incorrect?

a) Not all identification schemes can be used to get a signature scheme
b) Any encryption scheme can be used to get an identification scheme
c) Public-Key Identification Schemes provides security against passive adversary only
d) CCA-secure Hybrid Ciphers Based on Diffie-Hellman Problems require only DDH-assumption to be true

Q2. The security of which of the following cryptographic construction(s) is based on the hardness of the Discrete logarithm problem?

a) Pedersenâ€™s commitment scheme
b) El Gamal encryption scheme
c) Schnorr signature scheme
d) None of the above

Q3.

a) If Î  is secure then Î â€™ is also secure
b) Even if Î  is secure, Î â€™ is not necessarily secure
c) Even if Î  is insecure, Î â€™ is always secure
d) The security of Î  and Î ’ are not related

Q4. Consider the following security experiment against the text-book RSA signature: the PPT adversary is given the public verification key vk and a message m (from the message space) by the verifier. The challenge for the adversary is to then come up with a valid signature on m, without getting the signing-oracle access at all. Then

a) If the RSA assumption holds, then the adversary can win the experiment only with a negligible probability
b) Even if the RSA assumption holds, the adversary can win the experiment with a non-negligible probability
c) The probability of the adversary winning the experiment cannot be related to the hardness of the RSA problem
d) None of the above

Q5.

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