JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD MCA 2018 INFORMATION SECURITY Previous Question Paper (January - 2018 - R15)
Note: This question paper contains two parts A and B. Part A is compulsory which carries 25 marks. Answer all questions in Part A. Part B consists of 5 Units. Answer any one full question from each unit. Each question carries 10 marks and may have a, b, c as sub questions.
Part A
5 x 5 Marks = 25
Explain in detail various types of attacks on encrypted messages.
Answer
Attacks on encrypted messages generally fall into four categories based on the information available to the attacker:
- Ciphertext-only attack: The attacker has access only to the ciphertext and attempts to recover the plaintext or the key through statistical analysis or brute force.
- Known-plaintext attack: The attacker has access to both the ciphertext and the corresponding plaintext for one or more messages, which can be used to deduce the key.
- Chosen-plaintext attack: The attacker can choose arbitrary plaintexts and obtain their corresponding ciphertexts, allowing for more sophisticated cryptanalysis.
- Chosen-ciphertext attack: The attacker can select ciphertexts and obtain the corresponding plaintexts, often used to exploit weaknesses in decryption algorithms.
Explain briefly about RSA algorithm in detail manner.
Answer
The RSA algorithm is a public-key cryptosystem based on the difficulty of factoring large prime numbers. The process involves three main steps:
- Key Generation: Select two large primes p and q, compute n = p × q, and calculate Euler's totient function φ(n) = (p-1)(q-1). Choose a public exponent e such that 1 < e < φ(n) and gcd(e, φ(n)) = 1. Calculate the private key d as the modular multiplicative inverse of e modulo φ(n).
- Encryption: The ciphertext C is calculated as C = Me mod n, where M is the plaintext message.
- Decryption: The original message M is recovered using the private key d via M = Cd mod n.
Describe how hash algorithms will provide security.
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Explain about IP traffic processing in IP security Policy.
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Define firewall. Explain the firewall design principles in a detail manner.
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Part B
Explain about the model for internetwork security.
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Convert the following plain text message P = “cryptography provides high security” into cipher text by using simple columnar transposition technique i) Basic technique ii) With multiple rounds.
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With a neat diagram explain simplified model of conventional Encryption.
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Differentiate between symmetric and asymmetric key cryptography.
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Illustrate the procedure of key distribution in conventional encryption.
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Differentiate between AES, DES and Blow fish algorithms.
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Explain round function evaluation in feistel cipher structure.
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Write the difference between session key and master key.
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Write in detail what types of attacks are addressed by message authentication.
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Describe what arithmetical and logical functions are used in MD5?
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With a neat diagram explain Kerberos security mechanism. And also explain how Kerberos is important in real time for providing security?
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What is the difference between a public key and private key.
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Explain on what basis Zimmerman has developed PGP for email security?
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With a neat diagram explain function modules and standardized protocols used between them in Internet mail architecture.
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Explain in detail about IP security overview?
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Write the difference between PGP and MIME types.
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Write in a detail manner that define the parameters of an SSL session state.
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Write differences between socket layer security and transport security.
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Briefly explain What are the different types of firewalls.
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Enumerate counter measures for viruses and worms.
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