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This is a computer science engineering quiz on cryptography and network security, which includes questions on Other Public Key Cryptosystems and Cryptographic Hash Functions.
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.
Case b ( refer Figure 1 From The chapter Message Authentication Codes in William Stallings )is an example of digital signature.
What is a one-way password file?
A larger hash code cannot be decomposed into independent subcodes.
In the Theta step function, which is a substitution step, each bit value changes. Each bit is dependent on _________ other bits for its new value.
Which step function provides most amount of diffusion for the Keccak iteration step?
The Pi step function can be written as-
The CHI step involves which of the following gate operations?
What are the new co-ordinates for (x, y) in the Rho step for t =3?
Which matrix is used in the Rho/ Pi steps?
How many bit positions are active and can affect L[0, 0] in the Iota step function?
When a hash function is used to provide message authentication, the hash function value is referred to as:
Message Field
Message Digest
Message Score
Message Leap
Message authentication code is also known as?
Key code
Hash code
Keyed hash function
Message key hash function
The Rho function is defined as : a[x, y, z] ← a[x, y, z-g(t)], where g(t) is defined as:
(t+1)(t+2)/2
(t+1)(t-2)/2
(t-1)(t-2)/2
(t-1)(t+2)/2
The Chi function is defined as:
a[x] ← a[x] XOR ( a[x + 1]XOR 1) AND a[x+2])
a[x] ← a[x] AND ( a[x + 1]XOR 1) AND a[x+2])
a[x] ← a[x] AND ( a[x + 1] XOR a[x+2])
a[x] ← a[x] XOR ( a[x + 1] AND a[x+2])
