**NPTEL Cryptography And Network Security Assignment 7 Answers 2022:-** In this post, We have provided answers of Cryptography And Network Security Assignment 7. We provided answers here only for reference. Plz, do your assignment at your own knowledge.

## About Cryptography And Network Security

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 giving 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 understand challenges for cybersecurity that includes network security, data security, mobile security, cloud security and endpoint security. **CRITERIA TO GET A CERTIFICATE**

Average assignment score = 25% of the average of the best 8 assignments out of the total 12 assignments given in the course.

Exam score = 75% of the proctored certification exam score out of 100

Final score = Average assignment score + Exam score**YOU WILL BE ELIGIBLE FOR A CERTIFICATE ONLY IF AVERAGE ASSIGNMENT SCORE >=10/25 AND EXAM SCORE >= 30/75. If one of the 2 criteria is not met, you will not get the certificate even if the Final score >= 40/100.**

## Cryptography And Network Security Assignment 7 Answers 2022

**1. If r = 4(mod 17), r = 3(mod 11), then r =. (mod 187). **

(a) 32

(b) 157

(c) 34

(d) 23

Answer:-b

**2. Rabin cryptosystem is secure under the hardness of__________. **

(a) decoding problem

(b) discrete logarithm problem

(c) factorization

(d) Subset-sum

Answer:-c

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3.

Answer:-c

**4. (11/51) +(7/11) =____________**

(a) 1

(b) 0

(c)2

(d)-1

Answer:-b

**5. All quadratic residues modulo 17 are_________________. **

(a) 1,2,4, 8, 9, 13, 14, 16

(b) 1,2,4, 8,9, 11, 15, 16

(c) 1,2,3,8, 9, 13, 15, 16

(d) 1,2,4, 8,9, 13, 15, 16

Answer:-d

**6. Let p, q are odd positive integers. Then, (p/q)= -(q/p)if **

(a) p=q= 3(mod 4)

(b) p=q= 1(mod 4)

(C)p= q= 2(mod 4)

(d) none of these above

Answer:-a

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**7. Using Rabin cryptosystem with n = 161, encrypt message m = 24. The Ciphertext is ____________.**

(a) 47

(b) 44

(c) 65

(d) 93

Answer:-d

**8. Quadratic non-residues modulo 19 are ___________.**

(a) 2,3,8, 10, 12, 13, 14, 17, 18

(b) 2,3,8, 11, 12, 13, 14, 15, 18

(c) 2,4,8, 10, 12, 13, 14, 15, 18

(d) 2,3,8, 10, 12, 13, 14, 15, 18

Answer:-d

9.

Answer:-c

**10. Evaluate (4015/331).**

(a). 0

(b). 2

(c). -1

(d). 1

Answer:-d

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