# NPTEL Cryptography And Network Security Assignment 2 Answer

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**“NPTEL Cryptography And Network Security Assignment 2 Answer”**

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## NPTEL Cryptography And Network Security Assignment

The aim of this course is to introduce the student to the areas of cryptography and cryptanalysis. This course develops a basic understanding of the algorithms used to protect users online and to understand some of the design choices behind these algorithms. Our aim is to develop a workable knowledge of the mathematics used in cryptology in this course. The course emphasizes to give a basic understanding of previous attacks on cryptosystems with the aim of preventing future attacks. A wide variety of basic cryptographic primitives will be discussed along with recent developments in some advanced topics like identity-based encryption, attribute-based encryption, functional encryption, two-party/multi-party computation, bitcoin and crypto-currency and postquantum cryptography. The cryptanalysis part will help us understanding challenges for cybersecurity that includes network security, data security, mobile security, cloud security and endpoint security.

**INDUSTRY SUPPORT :**Stratign FZE, Dubai(UAE), SAG, DRDO, ISRO, WESEE, NTRO.

**Next Week Assignment Answers**

This course can have Associate in Nursing unproctored programming communication conjointly excluding the Proctored communication, please check announcement section for date and time. The programming communication can have a weightage of twenty fifth towards the ultimate score.

- Assignment score = 25% of average of best 8 assignments out of the total 12 assignments given in the course.
**( All assignments in a particular week will be counted towards final scoring – quizzes and programming assignments).**- Unproctored programming exam score = 25% of the average scores obtained as part of Unproctored programming exam – out of 100
- Proctored Exam score =50% of the proctored certification exam score out of 100

**YOU WILL BE ELIGIBLE FOR A CERTIFICATE ONLY IF ASSIGNMENT SCORE >=10/25 AND**

**UNPROCTORED PROGRAMMING EXAM SCORE >=10/25 AND PROCTORED EXAM SCORE >= 20/50.**

**If any one of the 3 criteria is not met, you will not be eligible for the certificate even if the Final score >= 40/100.**

**CHECK HERE OTHERS NPTEL ASSIGNMENTS ANSWERS **

*BELOW YOU CAN GET YOUR NPTEL Cryptography And Network Security Assignment 2 Answer 2022***?** :

**?**:

**Q1. What is the size of plaintext in Data Encryption Standard(DES)?
**

(a) 28

(b) 54

(c) 64

(d) 92

Answer:-c

**Q2. DES is a rOund Feistel cipher having block length ..
**

(a) 16,64

(b) 8,56

(c) 16,16

(d) 16,32

Answer:-a

**3. What kind of cipher DES is ?
**

(a) block cipher

(b) stream cipher

(c) bit cipher

(d) permutation cipher

Answer:-a

**4. A cryptosystem has perfect secrecy if P _{r}[xly]= P_{r}[x] for all X E P, y E C, where P and C are the plaintext space and ciphertext space respectively. The above statement is ..**

(a) True

(b) False

Answer:-a

**5. For a stream cipher, the plaintext and the key are given by 1000 and 0100, respectively. Then the ciphertext is .
**

(a) 1111

(b) 0000

(c) 1100

(d) 0011

Answer:-c

**6. What is the size of output produced by each S-box in DES algorithm?
**

(a) 8

(b) 4

(c) 2

(d) 16

Answer:-b

**7. Consider one bit encryption C = P®K and Pr(K = 0) = Pr(K = 1) = 0.5, Pr(P = 0) = 0.6, Pr(P = 1) = 0.4. Then Pr(P= 0|C = 1) 1S ….
**

(a) 0.5

(b) 0.4

(c) 0

**.**6

(d) None of these

Answer:-c

**8. How many rounds a Data Encryption Standard (DES) system has with an initial and final permutation block?
**

(a) 16

(b) 8

(c) 32

(d) None of these

Answer:-a

**9. One-time pad possesses perfect secrecy. The above statement is…
**

(a) True

(b) False

Answer:-a

**10. The key size of DES is ..
**

(a) 48

(b) 32

(c) 64

(d) 56

Answer:-d

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