Recent questions tagged cryptography

+2 votes

1 answer

1

ISRO2020-45
Avalanche effect in cryptography refers Large change 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

asked Jan 13 in Computer Networks by Satbir Boss (23.8k points) | 144 views

+1 vote

2 answers

2

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

asked Jan 13 in Computer Networks by Satbir Boss (23.8k points) | 114 views

0 votes

0 answers

3

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.

asked Mar 19, 2019 in Computer Networks by ajaysoni1924 Boss (10.8k points) | 59 views

0 votes

0 answers

4

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?

asked Mar 19, 2019 in Computer Networks by ajaysoni1924 Boss (10.8k points) | 43 views

0 votes

1 answer

5

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.

asked Mar 19, 2019 in Computer Networks by ajaysoni1924 Boss (10.8k points) | 73 views

0 votes

0 answers

6

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).

asked Mar 19, 2019 in Computer Networks by ajaysoni1924 Boss (10.8k points) | 41 views

0 votes

1 answer

7

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?

asked Jan 27, 2019 in Numerical Ability by screddy1313 (481 points) | 204 views

0 votes

1 answer

8

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

asked Jan 26, 2019 in Computer Networks by Nandkishor3939 Active (1.3k points) | 86 views

0 votes

1 answer

9

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

asked Dec 10, 2018 in Computer Networks by Fida (69 points) | 262 views

0 votes

0 answers

10

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

asked Nov 13, 2018 in Computer Networks by Fida (69 points) | 305 views

0 votes

1 answer

11

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

asked Oct 12, 2018 in Computer Networks by Shivangi Parashar 2 (307 points) | 224 views

+1 vote

1 answer

12

Diffie Hellman

asked Sep 15, 2018 in Computer Networks by Na462 Loyal (7k points) | 179 views

0 votes

0 answers

13

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)

asked Aug 5, 2018 in Computer Networks by Balaji Jegan Active (5k points) | 124 views

+2 votes

2 answers

14

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 ________

asked Jul 23, 2018 in Computer Networks by piya (191 points) | 1.2k views

0 votes

1 answer

15

UGCNET-July-2018-II-45
Match the following symmetric block ciphers with corresponding block and key sizes: List - I List -II a DES i block size 64 and key size ranges between 32 and 448 b IDEA ii block size 64 and key size 64 c BLOW FISH iii block size 128 and key sizes 128, 192, 256 d AES iv block size 64 and key ... -i; d-iii a-ii; b-iv; c-i; d-iii a-ii; b-iv; c-iii; d-i a-iv; b-ii; c-iii; d-i

asked Jul 13, 2018 in Others by Pooja Khatri Boss (10.9k points) | 433 views

0 votes

4 answers

16

UGCNET-July-2018-II-48
Decrypt the message "WTAAD" using the Caesar Cipher with key =15 LIPPS HELLO PLLEH DAATW

asked Jul 13, 2018 in Others by Pooja Khatri Boss (10.9k points) | 1.2k views

0 votes

2 answers

17

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

asked Jul 13, 2018 in Others by Pooja Khatri Boss (10.9k points) | 1.4k views

0 votes

0 answers

18

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

asked May 2, 2018 in Others by Sri (55 points) | 65 views

+1 vote

4 answers

19

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

asked Apr 22, 2018 in Computer Networks by Arjun Veteran (431k points) | 1.1k views

+2 votes

0 answers

20

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?

asked Jan 12, 2018 in Computer Networks by Ashish Sharma 3 (341 points) | 516 views

0 votes

1 answer

21

MadeEasy Test Series: Computer Networks - Network Security
Consider the following statements with respect to digital signatures: S1: Digital signature ensures authenticity of the sender but not integrity of the message. S2: A single secret key can be used by the sender to sign multiple ... Both RSA cryptosystem and RSA digital signature scheme uses same set of keys. Which of the following is true?

asked Dec 3, 2017 in Computer Networks by Appu B (259 points) | 195 views

0 votes

1 answer

22

Doubt!
You generate a perfectly random key K. You send two messages, M1 and M2, encrypted with K (C1 = K xor M1 and C2 = K xor M2). Does sending C2 leak information about M1 and M2?

asked Dec 2, 2017 in Computer Networks by vijay_jr Active (1.1k points) | 82 views

+2 votes

1 answer

23

Networking
Using RSA, choose p = 3 and q = 11, and encrypt “DOG” as one message m.

asked Jul 4, 2017 in Computer Networks by reena_kandari Loyal (8.3k points) | 153 views

+33 votes

3 answers

24

GATE2017-1-15
A sender $S$ sends a message $m$ to receiver $R$, which is digitally signed by $S$ with its private key. In this scenario, one or more of the following security violations can take place. $S$ can launch a birthday attack to replace $m$ with a ... $m$ with a fraudulent message Which of the following are possible security violations? I and II only I only II only II and III only

asked Feb 14, 2017 in Computer Networks by Arjun Veteran (431k points) | 5.2k views

0 votes

1 answer

25

MadeEasy Subject Test: Computer Networks - Cryptography

asked Feb 7, 2017 in Computer Networks by pkb Junior (621 points) | 113 views

0 votes

1 answer

26

Ace Test Series: Computer Networks - Cryptography

asked Jan 1, 2017 in Computer Networks by chaser (321 points) | 93 views

+3 votes

2 answers

27

UGCNET-AUG2016-III-30
The plain text message $BAHI$ encrypted with $RSA$ algorithm using $e = 3, d = 7$ and $n = 33$ and the characters of the message are encoded using the values $00$ to $25$ for letters A to Z. Suppose character by character encryption was implemented. Then, the Cipher Text message is _____. ABHI HAQC IHBA BHQC

asked Oct 1, 2016 in Computer Networks by makhdoom ghaya Boss (30.7k points) | 1.9k views

0 votes

1 answer

28

Cryptography
what is the difference between public key and private key ?

asked Sep 1, 2016 in Computer Networks by Karthik Akula (447 points) | 335 views

+3 votes

1 answer

29

UGCNET-Dec2013-III-32
Find the false statement: In Modern Cryptography, symmetric key algorithms use same key both for Encryption and Decryption. The symmetric cipher DES (Data Encryption Standard) was widely used in the industry for security product. The AES (Advanced ... key lengths of size 56 bits and 124 bits. Public key algorithms use two different keys for Encryption and Decryption

asked Jul 28, 2016 in Computer Networks by jothee Veteran (105k points) | 621 views

+1 vote

1 answer

30

UGCNET-Sep2013-III-57
If user A wants to send an encrypted message to user B, the plain text of A is encrypted with the Public key of user A Public key of user B Private key of user A Private key of user B

asked Jul 24, 2016 in Others by jothee Veteran (105k points) | 685 views

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