Anna University Regulation 2013 Computer Science & Engineering (CSE) CS6701 CNS 2marks & 16marks for all 5 units are provided below. Download link for CSE 7th SEM CS6701 Cryptography & Network Security Short answers, Question Bank is listed down for students to make perfect utilization and score maximum marks with our study materials.
2 Marks – UNIT I
1. Specify the four categories of security threads?
- Interruption
- Interception
- Modification
- Fabrication
2. Explain active and passive attack with example?
Passive attack: Monitoring the message during transmission. Eg: Interception
Active attack: It involves the modification of data stream or creation of false data stream. E.g.: Fabrication, Modification, and Interruption
3. Define integrity and non repudiation?
Integrity: Service that ensures that only authorized person able to modify the message.
Non repudiation: This service helps to prove that the person who denies the transaction is true or false.
4. Differentiate symmetric and asymmetric encryption?
- Symmetric Asymmetric It is a form of crypto-system in which encryption and decryption performed using the same key.
- It is a form of cryptosystem in which encryption and decryption
- Performed using two keys. Eg: DES, AES Eg: RSA, ECC
5. Define cryptanalysis?
It is a process of attempting to discover the key or plain text or both.
6. Compare stream cipher with block cipher with example.
Stream cipher: Processes the input stream continuously and producing one element at a time.
Example: caeser cipher.
Block cipher:
Processes the input one block of elements at a time producing an output block for each input block.
Example: DES.
7. Define security mechanism
It is process that is designed to detect prevent, recover from a security attack. Example: Encryption algorithm, Digital signature, Authentication protocols.
8. Differentiate unconditionally secured and computationally secured
An Encryption algorithm is unconditionally secured means, the condition is if the cipher text generated by the encryption scheme doesn’t contain enough information to determine corresponding plain text.
Encryption is computationally secured means,
1. The cost of breaking the cipher exceed the value of enough information.
2. Time required to break the cipher exceed the useful lifetime of information.
9. Define steganography
Hiding the message into some cover media. It conceals the existence of a message.
10. Why network need security?
When systems are connected through the network, attacks are possible during transmission time.
11. Define Encryption
The process of converting from plain text to cipher text.
12. Specify the components of encryption algorithm.
1. Plain text 2. Encryption algorithm
3. secret key 4. ciphertext 5. Decryption algorithm
13. Define confidentiality and authentication
Confidentiality: It means how to maintain the secrecy of message.
It ensures that the information in a computer system and transmitted information are accessible only for reading by authorized person.
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