# Cryptography And Network Security Assignment 7 Answers 2022

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`

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`

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`