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DRDO CSE 2022 Paper 2 | Question: 21
You work for a company $X$ in Bangalore. Due to floods, you have been allowed to work from home. You have your code in the server in the company and you have to access it securely to edit and modify. What is the one critical security protocol/tool that enables you to connect to your server securely?

admin asked in Computer Networks Dec 15, 2022

by admin

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DRDO CSE 2022 Paper 2 | Question: 23 (a)
Fill in the table below to create firewall rules that perform the actions described below on a local network with address $1.2.3.0$ (subnet $255.255.255.0).$ Assume that by default, all traffic will be accepted. You can refer to an entire network by ... use '*' to many 'any'. Action A: Block all traffic to any server on the local network. Write as Rule $1.$

admin asked in Computer Networks Dec 15, 2022

by admin

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UPSC Assistant Director (Systems) Exam
If a password hacker devised a system trying a password entry system by a program which ran once a second. How much time it would take to crack a password consisting of 4 out of the 24 alphabet letters? (a) 40 hrs approximately (b) 46 hrs approximately (c) 52 hrs approximately (d) 58 hrs approximately

Kumar RahulSingh asked in Computer Networks Nov 28, 2022

by Kumar RahulSingh

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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: (A) n(n-1) and 2n (B) 2n and ((n(n – 1))/2) (C) ((n(n – 1))/2) and 2n (D) ((n(n – 1))/2) and n

Jeetmoni saikia asked in Computer Networks Nov 18, 2022

by Jeetmoni saikia

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Consider a Diffie-Hellman scheme with a common prime q=11 and a primitive root a=2. a. If user A as public key YA=9 what is as private key XA? b. If user B has public key YB= 3 what is the shared secret key K?

JustPakYt asked in Computer Networks Nov 14, 2022

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Is Ipv6 & network security is in gate 2023?
Is Ipv6 & network security is in gate 2023?

Vijay_Ram asked in Computer Networks Oct 8, 2022

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NIELIT STA 2021
The DoS attack, in which the attacker establishes a large number of half-open or fully open TCP connections at the target host is: Vulnerability attack Bandwidth flooding Connection flooding UDP flooding

rsansiya111 asked in Computer Networks Dec 6, 2021

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UGC NET CSE | October 2020 | Part 2 | Question: 32
Using ‘RSA’ public key cryptosystem, if $p=3$, $q=11$ and $d=7$, find the value of $e$ and encrypt the number $’19’$ $20, 19$ $33,11$ $3, 28$ $77, 28$

go_editor asked in Computer Networks Nov 20, 2020

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UGC NET CSE | October 2020 | Part 2 | Question: 54
Which among the following statement(s) is(are) true? A hash function takes a message of arbitrary length and generates a fixed length code A hash function takes a message of fixed length and generates a code of variable length A hash function may give same hash value for ... below: $(a)$ only $(b)$ and $(c)$ only $(a)$ and $(c)$ only $(b)$ only

go_editor asked in Computer Networks Nov 20, 2020

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UGC NET CSE | October 2020 | Part 2 | Question: 60
Firewall is a device that filters access to the protected network from the outside network. Firewalls can filter the packets on the basis of Source IP address Destination IP address TCP Source Port UDP Source Port TCP Destination Port Choose the correct answer from the options given ... only $(c)$ and $(d)$ only $(a), (b), (c), (d)$ and $(e)$ only

go_editor asked in Computer Networks Nov 20, 2020

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UGC NET CSE | October 2020 | Part 2 | Question: 89
Given below are two statements: Statement $I$: In Ceasar Cipher each letter of Plain text is replaced by another letter for encryption Statement $II$: Diffie-Hellman algorithm is used for exchange of secret key In the light of the above ... Statement $I$ is correct but Statement $II$ is false Statement $I$ is incorrect but Statement $II$ is true

go_editor asked in Computer Networks Nov 20, 2020

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NIELIT 2016 MAR Scientist C - Section C: 38
How many bits are required to encode all twenty six letters, ten symbols, and ten numerals? $5$ $6$ $7$ $46$

Lakshman Bhaiya asked in Computer Networks Apr 2, 2020

by Lakshman Bhaiya

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NIELIT 2017 DEC Scientific Assistant A - Section B: 14
$PGP$ encrypts data by using a block cipher called : international data encryption algorithm private data encryption algorithm internet data encryption algorithm none of the options

Lakshman Bhaiya asked in Computer Networks Mar 31, 2020

by Lakshman Bhaiya

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NIELIT 2017 DEC Scientific Assistant A - Section B: 49
Why is one - time password safe ? It is easy to generate It cannot b shared It is different for every access It can be easily decrypted

Lakshman Bhaiya asked in Computer Networks Mar 31, 2020

by Lakshman Bhaiya

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2 votes

2 answers

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UGC NET CSE | June 2019 | Part 2 | Question: 89
The ability to inject packets into the Internet with a false source address is known as Man-in-the-middle attack IP phishing IP sniffing IP spoofing

Arjun asked in Computer Networks Jul 2, 2019

by Arjun

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1 vote

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UGC NET CSE | June 2019 | Part 2 | Question: 90
The RSA encryption algorithm also works in reverse, that is, you can encrypt a message with the private key and decrypt it using the public key. This property is used in instruction detection systems digital signatures data compression certification

Arjun asked in Computer Networks Jul 2, 2019

by Arjun

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Andrew S. Tanenbaum Edition 5th Exercise 8 Question 22 (Page No. 873)
A math class has 25 students. Assuming that all of the students were born in the first half of the year—between January 1st and June 30th— what is the probability that at least two students have the same birthday? Assume that nobody was born on leap day, so there are 181 possible birthdays.

ajaysoni1924 asked in Computer Networks Mar 19, 2019

by ajaysoni1924

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Andrew S. Tanenbaum Edition 5th Exercise 8 Question 33 (Page No. 874)
33. Two users can establish a shared secret key using the Diffie-Hellman algorithm, even if they have never met, share no secrets, and have no certificates (a) Explain how this algorithm is susceptible to a man-in-the-middle attack. (b) How would this susceptibility change if n or g were secret?

ajaysoni1924 asked in Computer Networks Mar 19, 2019

by ajaysoni1924

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19

Andrew S. Tanenbaum Edition 5th Exercise 8 Question 32 (Page No. 874)
The Diffie-Hellman key exchange is being used to establish a secret key between Alice and Bob. Alice sends Bob (227, 5, 82). Bob responds with (125). Alice’s secret number, x, is 12, and Bob’s secret number, y, is 3. Show how Alice and Bob compute the secret key.

ajaysoni1924 asked in Computer Networks Mar 19, 2019

by ajaysoni1924

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Andrew S. Tanenbaum Edition 5th Exercise 8 Question 25 (Page No. 873)
Alice wants to communicate with Bob, using public-key cryptography. She establishes a connection to someone she hopes is Bob. She asks him for his public key and he sends it to her in plaintext along with an X.509 certificate signed ... that Bob does not care who he is talking to (e.g., Bob is some kind of public service).

ajaysoni1924 asked in Computer Networks Mar 19, 2019

by ajaysoni1924

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Andrew S. Tanenbaum Edition 5th Exercise 8 Question 18 (Page No. 873)
Alice and Bob use RSA public key encryption in order to communicate between them. Trudy finds out that Alice and Bob shared one of the primes used to determine the number n of their public key pairs. In other words, Trudy found out that na = pa × q and nb = pb × q. How can Trudy use this information to break Alice’s code?

ajaysoni1924 asked in Computer Networks Mar 19, 2019

by ajaysoni1924

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2 answers

22

Andrew S. Tanenbaum Edition 5th Exercise 8 Question 17 (Page No. 873)
Using the RSA public key cryptosystem, with a = 1, b = 2 . . . y = 25, z = 26. (a) If p = 5 and q = 13, list five legal values for d. (b) If p = 5, q = 31, and d = 37, find e. (c) Using p = 3, q = 11, and d = 9, find e and encrypt ‘‘hello’’.

ajaysoni1924 asked in Computer Networks Mar 19, 2019

by ajaysoni1924

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DIGITAL CERTIFICATE ( Self Doubts)
I'm not able to distinguish the difference between digital certificate and digital signature Correct me if there is flaw in my understanding : A Digital Certificate is certificate of authenticity and it is given to any host by a trusted third ... hand is dished out by the client/server whenever it attempts to make any data transfer and it ensure data integrity

s_dr_13 asked in Computer Networks Mar 11, 2019

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13 votes

6 answers

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GATE CSE 2019 | Question: 54
In an RSA cryptosystem, the value of the public modulus parameter $n$ is $3007$. If it is also known as that $\phi(n)=2880$ where $\phi()$ denotes Euler’s Totient Function, then the prime factor of $n$ which is greater than $50$ is _________

Arjun asked in Computer Networks Feb 7, 2019

by Arjun

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Ace Test Series: Computer Networks - IP Inverse

Shubhanshu asked in Computer Networks Jan 19, 2019

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UGC NET CSE | December 2018 | Part 2 | Question: 66
Which of the following statement/s is/are true? Firewalls can screen traffic going into or out of an organization. Virtual private networks can stimulate an old leased network to provide certain desirable properties. Choose the correct answer from the code given below: (i) only (ii) only Both (i) and (ii) Neither (i) nor (ii)

Arjun asked in Computer Networks Jan 2, 2019

by Arjun

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UGC NET CSE | December 2018 | Part 2 | Question: 90
Suppose that everyone in a group of $N$ people wants to communicate secretly with $(N-1)$ other people using symmetric key cryptographic system. The communication between any two persons should not be decodable by the others in the group. The number of keys ... whole to satisfy the confidentiality requirement is $N(N-1)$ $N(N-1)/2$ $2N$ $(N-1)^2$

Arjun asked in Computer Networks Jan 2, 2019

by Arjun

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28

Security
It is impossible to produce a document that differs from the original document with single bit change and valid signature I am unable to understand, why is it impossible? bit changing is one way of intruder to steal information.right? plz give some valid reason

srestha asked in Computer Networks Dec 31, 2018

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3 votes

1 answer

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GATE Overflow | Mock GATE | Test 1 | Question: 22
Which of the following is TRUE with respect to Diffie-Hellman Key exchange algorithm? It can be used for encryption or decryption purpose It doesn't suffer from man in the middle attack It suffers from bucket brigade attack It is an example of private key cryptography algorithm

Ruturaj Mohanty asked in Computer Networks Dec 27, 2018

by Ruturaj Mohanty

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30

gfg quiz
From a large set of prime numbers Jimmy choose 23 and 17 as P and Q respectively and a random integer to be 13. Jimmy wants to sends a plain text to M = 127. What will be the value of cipher text using RSA? since i am getting ciphertext =(127^13) mod 391 now how should i calculate

vijju532 asked in Computer Networks Dec 17, 2018

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