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Recent questions tagged cryptography

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ISRO 2024
Asymmetric encryption is not suitable for Confidentiality Authentication Key Exchange Prevention of Denail of Service

Ramayya asked in Others Jan 7

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1 answer

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DRDO CSE 2022 Paper 2 | Question: 25
Assume when encrypting $3$-bit plaintext with a block cipher with key $\text{K},$ ... with key $\mathrm{K}$ in counter mode (with initial counter value $=0):$ $\text{C}=100110000$ What was the plaintext?

admin asked in Computer Networks Dec 15, 2022

by admin

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DRDO CSE 2022 Paper 2 | Question: 26
Suppose $\mathrm{A}$ and $\mathrm{B}$ use Diffie-Hellnian key exchange. Let the commonly agreed (i.e., global public) prime number $(q)=13$ and the primitive root $(\alpha)=6$. If $\text{A}$ chose the private value $\left(X_{A}\right)=5$ ... value $\left(X_{B}\right)=4$. Find the shared secret key $(\mathrm{K})$ between $\mathrm{A}$ and $\mathrm{B}$

admin asked in Computer Networks Dec 15, 2022

by admin

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DRDO CSE 2022 Paper 2 | Question: 27
A transposition cipher (but not a rail-fence cipher) was used to produce the following ciphertext: $\text{X 2! H M E S S S E 2 Y T A 2 I I A}$ The key used was: $5 \; 2 \; 6 \; 3 \; 4 \; 1.$ What was the plaintext used (in English)?

admin asked in Computer Networks Dec 15, 2022

by admin

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5

Introduction to Modern Cryptography
Let $\varepsilon>0$ be a constant. Say an encryption scheme is $\varepsilon$-perfectly secret if for every adversary $\mathcal{A}$ ... scheme that is $\varepsilon$-perfectly secret must have $|\mathcal{K}| \geq(1-2 \varepsilon) \cdot|\mathcal{M}| $

person asked in Computer Networks Oct 16, 2021

by person

208 views

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1 answer

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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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2 answers

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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 ... below: $(i)$ only $(ii)$ and $(iii)$ only $(i)$ and $(iii)$ only $(ii)$ only

go_editor asked in Computer Networks Nov 20, 2020

2.3k views

2 votes

6 answers

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UGC NET CSE | January 2017 | Part 2 | Question: 24
If $h$ is chosen from a universal collection of hash functions and is used to hash $n$ keys into a table of size $m$, where $n \leq m$, the expected number of collisions involving a particular key $x$ is less than __________. $1$ $1/n$ $1/m$ $n/m$

go_editor asked in DS Mar 24, 2020

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2 votes

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ISRO2020-45
Avalanche effect in cryptography refers Large changes in cipher text when the keyword is changed minimally Large changes in cipher text when the plain text is changed Large Impact of keyword change to length of the cipher text None of the above

Satbir asked in Computer Networks Jan 13, 2020

by Satbir

2.3k views

1 vote

2 answers

10

ISRO2020-44
In a columnar transportation cipher, the plain text is the tomato is a plant in the night shade family , keyword is $\text{TOMATO}$ . The cipher text is $\text{ TINESAX / EOAHTFX / HTLTHEY / MAIIAIX / TAPNGDL / OSTNHMX }$ ... $\text{ EOAHTFX / TINESAX / HTLTHEY / MAIIAIX / TAPNGDL / OSTNHMX }$

Satbir asked in Computer Networks Jan 13, 2020

by Satbir

3.4k views

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1 answer

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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

662 views

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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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1 answer

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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

1.7k views

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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

468 views

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1 answer

15

crypt arithmetic
If 356 + 123 = 512 .Then what is the value of 653 + 321? 1.215 2.974 3.1004 4.1304 How to solve these type questions?

screddy1313 asked in Quantitative Aptitude Jan 27, 2019

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1 answer

16

DH algorithm
How to calculate such a value: Please, someone explain because this is not possible on cal….!

Nandkishor3939 asked in Computer Networks Jan 25, 2019

by Nandkishor3939

455 views

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0 answers

17

UPPCL AE 2018:49
If you are running a website, you purchase a digital certificate from a certification authority, and send your digital certificate to any web-client connecting to your website in order to: Provide your password to access your website Provide ... your website Announce that you actually guarantee security of the website Provide your private key to users connecting to your website

admin asked in Computer Networks Jan 5, 2019

by admin

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UPPCL AE 2018:48
Which of the following always happens during the $\text{SSL/TLS}$ handshake? The server and client already use a fixed set of cryptographic algorithms that are pre-decided by the system administrators The client sends client hello with a set of ... distribution and fixing of algorithms are done offline so there is no need for any exchange of algorithm or key during the handshake

admin asked in Computer Networks Jan 5, 2019

by admin

340 views

1 vote

1 answer

19

Calculate mod in RSA algorithm
How to calculate Mod of a big number in RSA Like 5 raise to power 13 mod 77

Fida asked in Computer Networks Dec 10, 2018

by Fida

1.8k views

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0 answers

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Short cut to calculate d (private key) ins RSA algorithm
Please tell me shortcut to calculate d (private key) in RSA Algorithm

Fida asked in Computer Networks Nov 13, 2018

by Fida

1.9k views

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1 answer

21

Cryptography
Using RSA key crypto system with a = 1, b = 2 etc; value for encryption if prime value are p = 7 and q = 11, the legal value for secret key is . a)69 b)49 c)49 d)119

Shivangi Parashar 2 asked in Computer Networks Oct 12, 2018

by Shivangi Parashar 2

1.2k views

1 vote

1 answer

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Na462 asked in Computer Networks Sep 15, 2018

by Na462

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Cryptography Topics in Syllabus
Are the following topics there in Syllabus? Digital Signatures Elgamal Digital Signature Scheme Schnorr Digital Signature Scheme Message Authentication Codes Data Encryption Standard (DES) Advanced Encryption Standard (AES) Triple DES Elliptic Curve Cryptography Secure Hash Algorithm (SHA) Message Authentication Codes(MAC)

Balaji Jegan asked in Computer Networks Aug 5, 2018

by Balaji Jegan

537 views

2 votes

2 answers

24

MadeEasy Full Length Test 2019: Computer Networks - Rsa Security Networks
In an RSA system, the public key of given user is e = 31 and n = 3599. The private key of user will be ________

piya asked in Computer Networks Jul 23, 2018

by piya

12.0k views

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2 answers

25

UGC NET CSE | July 2018 | Part 2 | Question: 45
Match the following symmetric block ciphers with corresponding block and key sizes: ... $\text{a-ii; b-iv; c-iii; d-i}$ $\text{a-iv; b-ii; c-iii; d-i}$

Pooja Khatri asked in Computer Networks Jul 13, 2018

by Pooja Khatri

1.5k views

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4 answers

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UGC NET CSE | July 2018 | Part 2 | Question: 48
Decrypt the message "WTAAD" using the Caesar Cipher with key =15 LIPPS HELLO PLLEH DAATW

Pooja Khatri asked in Others Jul 13, 2018

by Pooja Khatri

5.3k views

0 votes

1 answer

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UGC NET CSE | July 2018 | Part 2 | Question: 50
Encrypt the Message "HELLO MY DEARZ" using Transposition Cipher with $Key \begin{cases} \text{Plain Text} & 2 4 1 3 \\ \text{Cipher Text} &1 2 3 4 \end{cases}$ HLLEO YM AEDRZ EHOLL ZYM RAED ELHL MDOY AZER ELHL DOMY ZAER

Pooja Khatri asked in Computer Networks Jul 13, 2018

by Pooja Khatri

4.5k views

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0 answers

28

group theory and cryptography
How is group theory and cryptography linked?

Sri asked in Others May 2, 2018

by Sri

409 views

2 votes

4 answers

29

ISRO2018-78
Which one of the following algorithm is not used in asymmetric key cryptography? RSA Algorithm Gillie-Hellman Algorithm Electronic Code Book Algorithm None of the above

Arjun asked in Computer Networks Apr 22, 2018

by Arjun

14.2k views

2 votes

0 answers

30

Cryptography - RSA Algorithm
In RSA Algorithm, we have public key(e,n) and private key(d,n). Sender side we encrypt plain text P as an integer between 0 and n-1 as follows: $P^{e}modn$ ... message P we are taking it as as integer between 0 and n-1. So, the P may not be coprime to n. Then how does the algorithm work?

Ashish Sharma 3 asked in Computer Networks Jan 12, 2018

by Ashish Sharma 3

1.1k views

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Recent questions tagged cryptography