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

View solution

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

View solution

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?

View solution

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?

View solution

Q. P = C1 – (d x C2)

Is this above stated formula true with respect to ECC?

View solution

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

View solution

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

View solution

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

View solution

Q. Message authentication code is also known as

View solution

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.

View solution

Q. What is a one-way password file?

View solution

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

View solution

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

View solution

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

View solution

Q. We define collision as: A collision occurs if we have x=y and H(x) = H(y).

View solution

Q. Consider the following properties:

Variable Input size
Fixed Output size
Efficiency
Pre image resistant
Second Pre image Resistant
Collision resistant
Pseudo randomness

A has function that satisfies the first _______ properties in the above table is referred to as a weak hash function.

View solution

Q. A function that is second pre-image resistant is also collision resistant.

View solution

Q. Which attack requires the least effort/computations?

View solution

Q. SHA-1 produces a hash value of

View solution

Q. What is the number of round computation steps in the SHA-256 algorithm?

View solution