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Recent questions tagged network-security

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61

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?

vijay_jr asked in Computer Networks Dec 2, 2017

361 views

1 vote

0 answers

62

Virtual Gate Test Series: Computer Networks - Layers
Match the following layers with their functionality. i. Encryption a. Data-Link Layer ii. Maintaining Synchronization Points b. Network Layer iii. Feedback Messages c. Session Layer iv. Physical Addressing System d. Presentation Layer How Maintain synchronization points is ... session layer? Correct option: $(C) i - d, ii - c, iii - b, iv - a$

Na462 asked in Computer Networks Nov 11, 2017

by Na462

711 views

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0 answers

63

Cryptography
Can a single secret key can be used by the sender to sign documents for multiple receiver ? I think we can because purpose of digital signature is to make sure that on the way data is not corrupted and also it is coming from the source expected by us.

akb1115 asked in Computer Networks Oct 29, 2017

646 views

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0 answers

64

REGARDING CRYPTOGRAPHY
WHAT ALL TOPICS SHOULD BE COVERED IN CRYPTOGRAPHY IN NETWORKS.?

ESHA_SHARMA asked in Computer Networks Oct 24, 2017

406 views

3 votes

3 answers

65

In a public key, private key cryptography, scheme given below, identify ‘A’ and ‘B’.
In a public key, private key cryptography, scheme given below, identify A' and B'. (a) A= Pu y , B= Pr x (c) A= Pr y , B= Pu x (b) A= Pr x , B= Pu y (d) A= Pu x , B= Pr y ... message to B, it will use B's public key and B will use its private key to decrypt the message. so how answer is option d?

sunil sarode asked in Computer Networks Oct 5, 2017

by sunil sarode

957 views

1 vote

1 answer

66

UGC NET CSE | June 2009 | Part 2 | Question: 48
After sending a message, the sender should not be able to, at a later date, deny having sent the message, is referred to as : Authenticity Non-Repudiability Auditability Repudiability

rishu_darkshadow asked in Computer Networks Sep 24, 2017

by rishu_darkshadow

908 views

1 vote

1 answer

67

Understanding Confusion and Diffusion - Network Security
Explain Confusion and Diffusion How it is implemented in DES AES

pC asked in Interview Questions Sep 19, 2017

by pC

1.5k views

4 votes

3 answers

68

ISRO2017-37
Pretty Good Privacy (PGP) is used in: Browser security FTP security Email security None of the above

sh!va asked in Computer Networks May 7, 2017

by sh!va

8.5k views

5 votes

1 answer

69

ISRO2017-36
Which protocol suite designed by IETF to provide security for a packet at the Internet layer? IPSec NetSec PacketSec SSL

sh!va asked in Computer Networks May 7, 2017

by sh!va

4.9k views

6 votes

3 answers

70

ISRO2017-35
$\text{MD5}$ is a widely used hash function for producing hash value of $64$ bits $128$ bits $512$ bits $1024$ bits

sh!va asked in Computer Networks May 7, 2017

by sh!va

4.3k views

0 votes

0 answers

71

Self doubt(Computer network security)

gabbar asked in Computer Networks Apr 2, 2017

by gabbar

425 views

39 votes

12 answers

72

GATE CSE 2017 Set 1 | Question: 44
In a RSA cryptosystem, a participant $A$ uses two prime numbers $p = 13$ and $q = 17$ to generate her public and private keys. If the public key of $A$ is $35$, then the private key of $A$ is __________ .

Arjun asked in Computer Networks Feb 14, 2017

by Arjun

23.8k views

39 votes

3 answers

73

GATE CSE 2017 Set 1 | Question: 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. $S$ ... with a fraudulent message Which of the following are possible security violations? I and II only I only II only II and III only

Arjun asked in Computer Networks Feb 14, 2017

by Arjun

12.5k views

0 votes

1 answer

74

NPTEL-Internetwork Security-Week2-Quiz-2-Q6
Q6. ___________Data Encryption Standard (DES) was designed to increase the size of the Data Encryption Standard (DES) key. (A) Double (B) Triple (C) Quadruple (D) none of these

Dulqar asked in Computer Networks Feb 3, 2017

by Dulqar

5.8k views

0 votes

2 answers

75

NPTEL-Internetwork Security-Week2-Quiz-2-Q3
Q3: What kind of ciphers Electronic Codebook (ECB) mode and Cipher Block Chaining (CBC) mode are (A) Block cipher (B) Stream cipher (C) Field cipher (D) both (A) and (B)

Dulqar asked in Computer Networks Feb 3, 2017

by Dulqar

752 views

0 votes

0 answers

76

harshit agarwal asked in Computer Networks Jan 2, 2017

by harshit agarwal

310 views

2 votes

2 answers

77

gatebook
Suppose that in RSA encryption, the public encryption key is the pair (e n)= (3, 55) and the private decryption key is the pair (d,n)=55, where d (A) 13 (B) 27 (C) 37 (D) 39

Shubham Pandey 2 asked in Computer Networks Nov 5, 2016

by Shubham Pandey 2

938 views

0 votes

2 answers

78

MadeEasy Test Series: Computer Networks - Network Security

KISHALAY DAS asked in Computer Networks Oct 18, 2016

by KISHALAY DAS

965 views

0 votes

1 answer

79

UGC NET CSE | August 2016 | Part 2 | Question: 46
An attacker sits between the sender and receiver and captures the information and retransmits to the receiver after some time without altering the information. This attack is called as _____. Denial of service attack Masquarade attack Simple attack Complex attack

makhdoom ghaya asked in Computer Networks Sep 28, 2016

by makhdoom ghaya

1.9k views

1 vote

1 answer

80

UGC NET CSE | June 2010 | Part 2 | Question: 5
For your ATM debit card, you have a $4$-decimal-digit personal secret code. In the absence of any clue, a brute-force attack takes time-$'t'$ to crack the code on an ATM terminal. Therefore $'t'$ is ... Reduce the processing speed of the ATM terminals to the half of their current speed. None of the above provides any improvement.

makhdoom ghaya asked in Computer Networks Sep 14, 2016

by makhdoom ghaya

1.1k views

0 votes

1 answer

81

UGC NET CSE | December 2010 | Part 2 | Question: 20
Which of the following is the process by which a user’s access to physical data in the application is limited, based on his privileges? Authorization Authentication Access Control All of these

makhdoom ghaya asked in Computer Networks Sep 7, 2016

by makhdoom ghaya

682 views

0 votes

1 answer

82

Network Security
Consider the scenarios. 1. A wifi connection without encryption. 2. Presence of malicious virus 3. Authentication with weak password. In network security paradigm given scenarios can be classified as: (A). 1. Threat 2. Threat 3. Vulnearability (B). 1. ... Threat 3. Threat (C). 1. Threat 2. Vulnearability 3. Vulnearability (D). 1. Vulnearability 2. Threat 3. Vulnearability

sh!va asked in Computer Networks Sep 7, 2016

by sh!va

1.5k views

1 vote

0 answers

83

Crytography
From where shall I study cryptography and network security for GATE?

chaser asked in Unknown Category Aug 28, 2016

by chaser

217 views

2 votes

1 answer

84

UGC NET CSE | June 2016 | Part 3 | Question: 30
Encrypt the plain text message $``\text{EXTRANET}"$ ... Using $`\text{Z'}$ as bogus character. $\text{TAXERTZENZ}$ $\text{EXTRANETZZ}$ $\text{EZXZTRZANZET}$ $\text{EXTZRANZETZ}$

go_editor asked in Computer Networks Aug 20, 2016

5.2k views

3 votes

2 answers

85

UGC NET CSE | June 2016 | Part 2 | Question: 29
If there are $N$ people in the world and are using secret key encryption and decryption for privacy purpose, then the number of secret keys required will be $N$ $(N-1)$ $\frac{N(N-1)}{2}$ $\frac{N(N+1)}{2}$

go_editor asked in Computer Networks Aug 16, 2016

3.9k views

2 votes

2 answers

86

UGC NET CSE | December 2015 | Part 2 | Question: 25
Using p=3, q=13, d=7 and e=3 in the RSA algorithm, what is the value of ciphertext for a plain text 5? 13 21 26 33

go_editor asked in Computer Networks Aug 8, 2016

2.8k views

3 votes

1 answer

87

UGC NET CSE | Junet 2015 | Part 3 | Question: 28
A message "COMPUTERNETWORK" encrypted (ignore quotes) using columnar transposition cipher with a key "LAYER". The encrypted message is CTTOEWMROPNRUEK MROUEKCTTPNROEW OEWPNRCTTUEKMRO UEKPNRMROOEQCTT

go_editor asked in Computer Networks Jul 31, 2016

5.3k views

2 votes

2 answers

88

UGC NET CSE | Junet 2015 | Part 3 | Question: 27
Which are two modes of IP security? Transport and certificate Transport and tunnel Certificate and tunnel Preshared and transport

go_editor asked in Computer Networks Jul 31, 2016

2.3k views

2 votes

1 answer

89

UGC NET CSE | December 2013 | Part 2 | Question: 5
Using the RSA public key crypto system, if p=13, q=31 and d=7, then the value of e is 101 103 105 107

go_editor asked in Computer Networks Jul 24, 2016

6.8k views

2 votes

0 answers

90

Compare the performance of various cryptographic algorithms
Compare the performance of various cryptographic algorithms A) p- AES q-3 DES r- DES s- RSA x-S box y- P box B) p- AES q-3 DES r- DES s- RSA x-P box y- S box C) p- RSA q-AES r-3 DES s- DES x-S box y- P box D) p- RSA q-AES r-3 DES s- DES x-P box y- S box

sh!va asked in Computer Networks Jul 22, 2016

by sh!va

527 views

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