Deck 5: Cryptography, Elliptic Curves, and Email Security

Question 1

In Elgamal cryptosystem, given the prime p=31,What is the respective plaintext character for C = (27, 20)?

A)h
B)l
C)o
D)m

Answer 1

h

Question 2

How many real and imaginary roots does the equation y2=x3-1 have

A)2 real, 1 imaginary
B)all real
C)all imaginary
D)2 imaginary, 1 real

Answer 2

2 imaginary, 1 real

Question 3

"In ECC, the inverse of point P =(x1, y1) is Q = (-x1, y1). "

Answer 3

False

Question 4

In the elliptic curve group defined by y2= x3- 17x + 16 over real numbers, what is P + Q if P = (0,-4) and Q = (1, 0)?

A)(15, -56)
B)(-23, -43)
C)(69, 26)
D)(12, -86)

Question 5

How many real and imaginary roots does the equation y2=x3-4x have

A)2 real, 1 imaginary
B)all real
C)all imaginary
D)2 imaginary, 1 real

Question 6

In the elliptic curve group defined by y2= x3- 17x + 16 over real numbers, what is 2P if P = (4, 3.464)

A)(12.022, -39.362)
B)(32.022, 42.249)
C)(11.694, -43.723)
D)(43.022, 39.362)

Question 7

In public key cryptosystem_______ keys are used for encryption and decryption.

A)same
B)different
C)encryption keys
D)none of the mentioned

Question 8

PGP system uses

A)private key system
B)public key system
C)private & public key system
D)none of the mentioned

Question 9

Knapsack problem can be solved by

A)public key cryptosystem
B)public key system
C)private & public key system
D)none of the mentioned

Question 10

Merkle hellman is a symmetric cryptosystem.

Question 11

In public key cryptosystem which is kept as public?

A)encryption keys
B)decryption keys
C)encryption & decryption keys
D)none of the mentioned

Question 12

A cryptographic hash function has variable output length.

Question 13

In a trapdoor function, the functions are easy to go in

A)one direction
B)two directions
C)all directions
D)none of the mentioned

Question 14

Which algorithm can be used to sign a message?

A)public key algorithm
B)private key algorith
C)public & private key algorithm
D)none of the mentioned

Question 15

In this Merkle Hellman method same key is used for encryption and decryption.

Question 16

A set of numbers is called as super increasing if

A)each element is greater than previous element
B)each element greater than sum of all the previous elements
C)each element greater than the average of all elements
D)each element lesser than the sum of all the elements

Question 17

There are________major ways of stealing email information.

A)2
B)3
C)4
D)5

Question 18

Which of them is not a major way of stealing email information?

A)stealing cookies
B)reverse engineering
C)password phishing
D)social engineering

Question 19

_________is the method for keeping sensitive information in email communication & accounts secure against unofficial access, loss, or compromise.

A)email security
B)email hacking
C)email protection
D)email safeguarding

Question 20

______is a famous technological medium for the spread of malware, facing problems of spam, & phishing attacks.

A)cloud
B)pen drive
C)website
D)email

Question 21

Fraudulent email messages are some fake email messages that seem legitimate which asks for your confidential bank details such as________details and passwords.

A)credit card, antivirus name
B)credit card, login id
C)cell phone, antivirus name
D)car model, account id

Question 22

Unsolicited Bulk E-mails (UBI) are called

A)sms
B)mms
C)spam emails
D)malicious emails

Question 23

Using email hacking illicit hackers can send & spread______virus________and spam emails.

A)trojans, redirected malicious urls
B)antivirus, patches
C)cracked software, redirected malicious urls
D)malware, security patches

Question 24

------------ is the technique used for tricking users to disclose their username and passwords through fake pages.

A)social engineering
B)phishing
C)cookie stealing
D)banner grabbing

Question 25

Which of them is an example of grabbing email information?

A)cookie stealing
B)reverse engineering
C)port scanning
D)banner grabbing