Asymmetric Ciphers MCQ

Test your knowledge with important Asymmetric Ciphers MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30 + more Asymmetric Ciphers MCQs at Bissoy

• For the point P (7, 0) defined in the curve E13(1, 1). What is –P?
  ক

  (7,1)

  খ

  (8,12)

  গ

  (8,1)

  ঘ

  (7,0)
• For the point P (11, 2) defined in the curve E13(1, 1). What is –P?
  ক

  (12,4)

  খ

  (10,7)

  গ

  (11,11)

  ঘ

  (11,12)
• P = C1 – (d x C2) Is this above stated formula true with respect to ECC?
  ক

  True

  খ

  False
• Bob selects E67(2, 3) as the elliptic curve over GF(p). He selects e1 = (2, 22) and d = 4. Then he calculates e2 = d × e1 and the publicly announces the tuple (E, e1, e2). Now, Alice wants to send the plaintext P = (24, 26) to Bob and she selects r = 2. What are C1 and C2?
  ক

  C1=(35,1) ; C2 =(21,44)

  খ

  C1=(44,21) ; C2 =(1,35)

  গ

  C1=(44,21) ; C2 =(44,21)

  ঘ

  C1=(21,44); C2 =(35,1)
• Bob selects E67(2, 3) as the elliptic curve over GF(p). He selects e1 = (2, 22) and d = 4. Then he calculates e2 = d × e1 .What is the value of e2?
  ক

  (23,49)

  খ

  (16,55)

  গ

  (12,19)

  ঘ

  (13,45)
• Multiply the point P=(8, 1) by a constant 3, thus find 3P, in the elliptic curve E13(1, 1)
  ক

  (10,7)

  খ

  (12,6)

  গ

  (11,1)

  ঘ

  (9,8)
• If P = (1,4) in the elliptic curve E13(1, 1) , then 4P is
  ক

  (4, 2)

  খ

  (7, 0)

  গ

  (5, 1)

  ঘ

  (8, 1)
• On adding the two points P (4,2) and Q (10, 6) in the elliptic curve E11(1,1) we get
  ক

  (9,3)

  খ

  (6,4)

  গ

  (7,5)

  ঘ

  (2,8)
• “In ECC, the inverse of point P =(x1, y1) is Q = (-x1, y1). “
  ক

  True

  খ

  False
• “Elliptic curve cryptography follows the associative property.”
  ক

  True

  খ

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

  (12.022, -39.362)

  খ

  (32.022, 42.249)

  গ

  (11.694, -43.723)

  ঘ

  (43.022, 39.362)
• 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)?
  ক

  (15, -56)

  খ

  (-23, -43)

  গ

  (69, 26)

  ঘ

  (12, -86)
• How many real and imaginary roots does the equation y2=x3-4x have
  ক

  2 real, 1 imaginary

  খ

  all real

  গ

  all imaginary

  ঘ

  2 imaginary, 1 real
• How many real and imaginary roots does the equation y2=x3-1 have
  ক

  2 real, 1 imaginary

  খ

  all real

  গ

  all imaginary

  ঘ

  2 imaginary, 1 real
• In Singular elliptic curve, the equation x^3+ax+b=0 does ____ roots.
  ক

  does not have three distinct

  খ

  has three distinct

  গ

  has three unique

  ঘ

  has three distinct unique
• What is the general equation for elliptic curve systems?
  ক

  y3+b_1 xy+b_2 y=x33+a_1 x2+a_2 x+a_3

  খ

  y3+b_1 x+b_2 y=x2+a_1 x2+a_2 x+a_3

  গ

  y2+b_1 xy+b_2 y=x3+a_1 x2+a_2

  ঘ

  y2+b_1 xy+b_2 y=x3+a_1 x2+a_2 x+a_3
• n = 35; e = 5; C = 10. What is the plaintext (use RSA) ?
  ক

  3

  খ

  7

  গ

  8

  ঘ

  5
• p = 17; q = 31; M = 2
  ক

  254

  খ

  423

  গ

  128

  ঘ

  523
• p = 11; q = 13; M = 7
  ক

  84

  খ

  124

  গ

  106

  ঘ

  76
• p = 7; q = 11; M = 8
  ক

  19

  খ

  57

  গ

  76

  ঘ

  59
• p = 5; q = 11; M = 9
  ক

  43

  খ

  14

  গ

  26

  ঘ

  37
• p = 3; q = 11; M = 5
  ক

  28

  খ

  26

  গ

  18

  ঘ

  12
• USENET falls under which category of public key sharing?
  ক

  Public announcement

  খ

  Publicly available directory

  গ

  Public-key authority

  ঘ

  Public-key certificates
• For p = 11 and q = 19 and choose d=17. Apply RSA algorithm where Cipher message=80 and thus find the plain text.
  ক

  54

  খ

  43

  গ

  5

  ঘ

  24
• For p = 11 and q = 19 and choose e=17. Apply RSA algorithm where message=5 and find the cipher text.
  ক

  C=80

  খ

  C=92

  গ

  C=56

  ঘ

  C=23
• In RSA, we select a value ‘e’ such that it lies between 0 and Ф(n) and it is relatively prime to Ф(n).
  ক

  True

  খ

  False
• In RSA, Ф(n) = _______ in terms of p and q.
  ক

  (p)/(q)

  খ

  (p)(q)

  গ

  (p-1)(q-1)

  ঘ

  (p+1)(q+1)
• In the RSA algorithm, we select 2 random large values ‘p’ and ‘q’. Which of the following is the property of ‘p’ and ‘q’?
  ক

  p and q should be divisible by Ф(n)

  খ

  p and q should be co-prime

  গ

  p and q should be prime

  ঘ

  p/q should give no remainder
• RSA is also a stream cipher like Merkel-Hellman.
  ক

  True

  খ

  False
• Compute private key (d, p, q) given public key (e=23, n=233 ´ 241=56,153).
  ক

  35212

  খ

  12543

  গ

  19367

  ঘ

  32432