Recent questions tagged cryptography

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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.

asked Mar 19 in Computer Networks by ajaysoni1924 Loyal (9.5k points) | 29 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?

asked Mar 19 in Computer Networks by ajaysoni1924 Loyal (9.5k points) | 18 views

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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.

asked Mar 19 in Computer Networks by ajaysoni1924 Loyal (9.5k points) | 22 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).

asked Mar 19 in Computer Networks by ajaysoni1924 Loyal (9.5k points) | 15 views

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1 answer

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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 in Numerical Ability by screddy1313 (455 points) | 176 views

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1 answer

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

asked Jan 26 in Computer Networks by Nandkishor3939 Active (1k points) | 68 views

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1 answer

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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 (63 points) | 194 views

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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

asked Nov 13, 2018 in Computer Networks by Fida (63 points) | 218 views

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1 answer

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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 (257 points) | 177 views

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1 answer

10

Diffie Hellman

asked Sep 15, 2018 in Computer Networks by Na462 Loyal (6.6k points) | 126 views

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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)

asked Aug 5, 2018 in Computer Networks by Balaji Jegan Active (4.8k points) | 79 views

+2 votes

2 answers

12

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) | 986 views

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1 answer

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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 (10.7k points) | 343 views

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4 answers

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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 (10.7k points) | 930 views

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2 answers

15

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 (10.7k points) | 1.1k views

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16

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

asked May 2, 2018 in Others by Sri (49 points) | 55 views

+2 votes

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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 (331 points) | 450 views

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1 answer

18

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) | 138 views

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1 answer

19

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) | 76 views

+2 votes

1 answer

20

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 (7.6k points) | 146 views

+23 votes

3 answers

21

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 (407k points) | 4.4k views

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1 answer

22

MadeEasy Subject Test: Computer Networks - Cryptography

asked Feb 7, 2017 in Computer Networks by pkb Junior (589 points) | 98 views

+1 vote

1 answer

23

MadeEasy Subject Test: Computer Networks - Cryptography

asked Jan 12, 2017 in Computer Networks by Akanksha Kesarwani Junior (945 points) | 88 views

0 votes

1 answer

24

Ace Test Series: Computer Networks - Cryptography

asked Jan 1, 2017 in Computer Networks by chaser (321 points) | 80 views

+3 votes

2 answers

25

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 (29.3k points) | 1.8k views

+3 votes

1 answer

26

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 (96.1k points) | 577 views

+1 vote

1 answer

27

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 (96.1k points) | 622 views

+1 vote

2 answers

28

UGCNET-Sep2013-III-3
Assume that each alphabet can have a value between 0 to 9 in a cryptoarithmetic problem Which of the following statements is true? No two alphabets can have the same numeric value Any two alphabets can have the same numeric value D=0 D=1 I and III I and IV II and III II and IV

asked Jul 22, 2016 in Others by jothee Veteran (96.1k points) | 539 views

+2 votes

3 answers

29

UGCNET-Dec2014-II-30
How many distinct stages are there in $DES$ algorithm, which is parameterized by a $56$-bit key ? $16$ $17$ $18$ $19$

asked Jul 21, 2016 in Computer Networks by makhdoom ghaya Boss (29.3k points) | 1.8k views

+1 vote

1 answer

30

UGCNET-Sep2013-II-3
Which of the following substitution technique have the relationship between a character in the plaintext and a character in the ciphertext as one-to-many? Monoalphabetic Polyalphabetic Transpositional None of the above

asked Jul 20, 2016 in Others by jothee Veteran (96.1k points) | 944 views

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