Define substitution technique in cryptography. List various substitution technique and discuss any one with an example.
What is the objective of attacking an encryption system? Write the two approaches to attack a conventional encryption scheme.
List various modes of operations of block cipher. Explain any three of them briefly.
Construct a Playfair matrix with the key “engineering”. And encrypt the message “test this process”.
Describe the Diffie-Hellman Key Exchange algorithm and how it enables secure key exchange between two parties. Explain the man-in-the-middle attack and how it can compromise the security of Diffie-Hellman.
Discuss RSA algorithm, focusing on its computational aspects and security. Discuss how public and private keys are generated and used in encryption and decryption.
What is the purpose of the State array? How many bytes in State are affected by ShiftRows?
Explain the structure of the Advanced Encryption Standard (AES), its transformation functions, and the key expansion process.
How does a Message Authentication Code (MAC) ensure message integrity and authenticity?
Briefly describe the main components of the Data Encryption Standard (DES) algorithm.
Discuss Kerberos as a secure authentication protocol. Explain its key components and how it protects against replay attacks.
Explain the process of remote user authentication using symmetric encryption. How does it ensure secure communication between parties?
What is a nonce? What is the difference between a session key and a master key?
Discuss the Secure Hash Algorithm (SHA) family. Explain how SHA functions are used in ensuring data integrity and their role in cryptographic applications.
What is public key cryptography? Explain the concept behind the public key cryptography and Compare it with conventional cryptography.
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Official Gujarat Technological University (GTU) examination paper and step-by-step solutions for Information security (IS) (Winter 2025, B.E. · Computer Engineering, Sem 7). Features complete 70-mark regular & remedial examination pattern, official marking distribution across all 5 questions, and direct 1-click official PDF download.
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