Q. How many real and imaginary roots does the equation y^2=x^3-4x have

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Q. In the elliptic curve group defined by y^2= x^3- 17x + 16 over real numbers, what is P + Q if P = (0,-4) and Q = (1, 0)?

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Q. In the elliptic curve group defined by y^2= x^3- 17x + 16 over real numbers, what is 2P if P = (4, 3.464)?

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Q. “Elliptic curve cryptography follows the associative property.”

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

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

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Q. If P = (1,4) in the elliptic curve E13(1, 1) , then 4P is

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Q. Multiply the point P=(8, 1) by a constant 3, thus find 3P, in the elliptic curve E13(1, 1)

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Q. 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?

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Q. 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?

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Q. P = C1 – (d x C2)

Is this above stated formula true with respect to ECC?

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Q. For the point P (11, 2) defined in the curve E13(1, 1). What is –P?

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

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Q. When a hash function is used to provide message authentication, the hash function value is referred to as

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Q. Message authentication code is also known as

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Q. The main difference in MACs and digital signatures is that, in digital signatures the hash value of the message is encrypted with a user’s public key.

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Q. What is a one-way password file?

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Q. Which one of the following is not an application hash functions?

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Q. If the compression function is collision resistant, then so is the resultant iterated hash function.

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Q. A larger hash code cannot be decomposed into independent subcodes.

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