**Cryptography And Network Security Assignment 4 Answers 2022:-** In this post, We have provided answers of NPTEL Cryptography And Network Security Assignment 4 . 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.**

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## Cryptography And Network Security Assignment 4 Answers 2022

**1. x ^{3}+x+1 over R is a ……… **

(a) reducible polynomial

(b) irreducible polynomial

(c) both(a) and (b)

(d) neither (a) nor (b)

Answer:-b

**2. Let f{x)= 2x ^{2}+3x+3 and g(x) = 3x^{2}+2x+1. Then the degree of f(x) + g{x) over Z_{5} is **

(a) 3

(b) 2

(c) 1

(d) 0

Answer:-b

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**3. What is the remainder when 3 ^{444} + 4^{333} is divided by 5? **

(a) 0

(b) 1

(c) 2

(d) 3

Answer:-a

**4. If p is an odd prime, then there are ……. quadratic residues. **

(a) p

(b) p-1

(c) (p-1)/2

(d) (p+1)/2

Answer:-c

**5. The quadratic residues mod 11 are …. **

(a) 1,3,4,5,9

(b) 1,2,3,4

(c) 1,3,5,7,8,9

(d) None of these

Answer:-a

**6. What is the remainder when _{66}^{6} is divided by 7? **

(a) 1

(b) 2

(c) 4

(d) 6

Answer:-a

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**7. Let p = 8 and q = 19. Then ├│(Pg)= .. **

(a) 70

(b) 57

(c) 38

(d) 72

Answer:-d

**8. Last digit of 32022 … **

(a) 3

(b) 5

(c) 7

(d) 9

Answer:-d

**9. If ged(a, n) = 1, then aon) = 1 (mod n), where o(n) is Euler’s totient function. The above statement is .. **

(a) True

(b) False

Answer:-a

**10. Let f(x) = 3x ^{3} +2x +1 and g(x) = x^{2}+4x +1. Then the degree of f(x) * g(x) over Z_{s} is **

(a) 3

(b) 2

(c) 4

(d) 5

Answer:-d

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**COURSE LAYOUT**

**Week 1:**Introduction to cryptography, Classical Cryptosystem, Block Cipher.**Week 2:**Data Encryption Standard (DES), Triple DES, Modes of Operation, Stream Cipher.**Week 3:**LFSR based Stream Cipher, Mathematical background, Abstract algebra, Number Theory.**Week 4:**Modular Inverse, Extended Euclid Algorithm, Fermat’s Little Theorem, Euler Phi-Function, Euler’s theorem.**Week 5:**Advanced Encryption Standard (AES), Introduction to Public Key Cryptosystem, Diffie-Hellman Key Exchange, Knapsack Cryptosystem, RSA Cryptosystem.**Week 6:**Primarily Testing, ElGamal Cryptosystem, Elliptic Curve over the Reals, Elliptic curve Modulo a Prime.**Week 7:**Generalized ElGamal Public Key Cryptosystem, Rabin Cryptosystem.**Week 8 :**Message Authentication, Digital Signature, Key Management, Key Exchange, Hash Function.**Week 9 :**Cryptographic Hash Function, Secure Hash Algorithm (SHA), Digital Signature Standard (DSS).**Week 10**: Cryptanalysis, Time-Memory Trade-off Attack, Differential and Linear Cryptanalysis.**Week 11**: Cryptanalysis on Stream Cipher, Modern Stream Ciphers, Shamir’s secret sharing and BE, Identity-based Encryption (IBE), Attribute-based Encryption (ABE).**Week 12:**Side-channel attack, The Secure Sockets Layer (SSL), Pretty Good Privacy (PGP), Introduction to Quantum Cryptography, Blockchain, Bitcoin and Cryptocurrency.