# NPTEL Foundations of Cryptography Assignment 3 Answers 2022

Are you looking for the Answers to NPTEL Foundations of Cryptography Assignment 3? This article will help you with the answer to the National Programme on Technology Enhanced Learning (NPTEL) Course “ NPTEL Foundations of Cryptography Assignment 3 “

## What is Foundations of Cryptography

The course provides the basic paradigm and principles of modern cryptography. The focus of this course will be on definitions and constructions of various cryptographic objects. We will try to understand what security properties are desirable in such objects, how to formally define these properties, and how to design objects that satisfy the definitions. The aim is that at the end of this course, the students are able to understand a significant portion of current cryptography research papers and standards.

## CRITERIA TO GET A CERTIFICATE

Average assignment score = 25% of the average of 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 THE 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.

Below you can find the answers for NPTEL Foundations of Cryptography Assignment 3

## NPTEL Foundations of Cryptography Assignment 3 Answers:-

Q1. Select the incorrect option(s) from the following:

a) Stream ciphers are deterministic

b) Stream ciphers are randomized

c) Same key can be used for encrypting multiple messages in stream ciphers

d) Stream ciphers are single-message CPA-secure

Q2. Which of the following is/are false for One-Way Functions (OWF)?

a)They are randomized functions

b) They are difficult to invert for all elements from the co-domain

c) They are always one-to-one function

d) They are deterministic functions

Q3. Which of the following candidates is(are) not necessarily secure PRF(s)? In all the following options, Fs (x) is a secure PRF, where x,s∈{0,1}n and output is also an n-bit string.

a) While using a PRG, same key can be used for every instance of encryption

b) If G(s) is a secure PRG, then G1 (s) ≝ G(s) || G(s+2) is also a secure PRG

???? Next Week Answers: Assignment 03 ????

Q4.

a)Algorithm Enck is single-message COA-secure

b) Algorithm Enck is single-message CPA-secure

c) Algorithm Enck is multi-message CPA-secure

d) None of these

Q5.

None of these