1

GATE CSE 2019

Numerical

+2

-0.67

In an RSA cryptosystem, the value of the public modulus parameter n is 3007. If it is also known that $$\varphi $$(n) = 2880, where $$\varphi $$() denotes Euler's Totient Function, then the prime factor of n which is greater than 50 is ______.

Your input ____

2

GATE CSE 2016 Set 1

MCQ (Single Correct Answer)

+2

-0.6

Consider that B wants to send a message m that is digitally signed to A. Let the pair of private and public keys for A and B be denoted by $$K_x^ - $$ and $$K_x^ + $$ for x = A, B, respectively. Let K

_{x}(m) represent the operation of encrypting m with a key K_{x}and H(m) represent the message digest. Which one of the following indicates the**CORRECT**way of sending the message m along with the digital signature to A?3

GATE CSE 2009

MCQ (Single Correct Answer)

+2

-0.6

In the RSA public key cryptosystem, the private and public keys are (e, n) and (d, n) respectively, where n = p$$ \times $$q and p and q are large primes. Besides, n is public and p and q are private. Let M be an integer such that 0 < M < n and f(n) = (p - 1)(q - 1). Now consider the following equations.

**I.** M'= M^{e} mod n

M = (M')^{d} mod n

**II.** ed ≡ 1 mod n

**III.** ed ≡ 1 mod $$\phi $$(n)

**IV.** M'= M^{e} mod $$\phi $$(n)

M = (M')^{d} mod $$\phi $$(n)

4

GATE CSE 2008

MCQ (Single Correct Answer)

+2

-0.6

The total number of keys required for a set of n individuals to be able to communicate with each other using secret key and public key crypto-systems, respectively are:

Questions Asked from Network Security (Marks 2)

Number in Brackets after Paper Indicates No. of Questions

GATE CSE Subjects

Theory of Computation

Operating Systems

Algorithms

Database Management System

Data Structures

Computer Networks

Software Engineering

Compiler Design

Web Technologies

General Aptitude

Discrete Mathematics

Programming Languages