Sec fun
RSA and Cryptography Challenge
Test your knowledge on asymmetric and symmetric cryptography with our comprehensive quiz! This quiz covers a wide range of topics in secure communication and gives you the chance to deepen your understanding.
Challenge yourself with questions such as:
- The hardest part of RSA operations
- Understanding digital signatures
- The importance of freshness in messages
Which of the following is considered the hardest part in RSA operation?
Finding the prime factors of n
Generate a Solve a linear systemrandom number
Generate a random number
Take powers: gr mod n
In general, asymmetric ciphers provide greater strength than symmetric ciphers for the same key length.
False
True
Which of the following does not fall under authentication attack?
Availability
Interleaving
Forced Delay
Impersonation
Which security protocol is being described in the following: Alice and Bob agree on a prime and a generator. 2. Alice and Bob generate private keys 3. They then send each other the generator exponentiated by their private key
Die Hellman
Integer Factorization
ElGamal
Digital Signature Algorithm (DSA)
How many keys are used for triple DES (3DES) algorithm?
1
2
3
4
"Lamport’s One Time Passwords prevents _________. "
Replay attack
Attack on integrity
Authentication attack
Attack on condentiality
What is the goal behind ensuring the "freshness" of a message?
To ensure that compromise of a individual session does not easily lead to compromise of future sessions
To ensure that compromise of a individual session does not easily lead to compromise of past sessions
To prevent pre-computation attacks and/or a brute force on the message space
To enforce message integrity and/or increase the prevelance of the avalanche eect
Which of the following causes selective forgery in ElGamal signature?
Weak generator chosen
Weak hash function
Prime number is not large
Weak private public key pairs
Digital Signature Algorithm (DSA) uses y = g x (mod p) for key generation
P
X
Y
G
What can a system designer do to reduce the effectiveness of precomputation attacks when attempting to crack all passwords in the system?
Salt the passwords
Encrypt the passwords with a strong symmetric cipher
Use a collision resistant hash function
Implement something to ensure "freshness"
Which of the following statement is true?
An algorithm that can solve DHP would also solve DLP.
An algorithm that can solve DLP would also solve DHP.
If an ecient algorithm for calculating discrete log is found, AES will not be secure.
True
False
Symmetric cryptography is very useful when performing key distribution.
False
True
For DES, using a 56-bit key and a 64-bit block, if exhaustive key search is used it is expected to yield the key in ______ operations
2 55
2 63
2 56
2 57
If an efficient algorithm for integer factorisation is found, Diffie Hellman would be insecure
False
True
Merkle's puzzles provide an efficient mechanism for key exchange
True
False
For symmetric key encryption, how many keys are required if 4 users wish to communicate with each other in the same network?
6
7
4
5
ElGamal Signature Scheme follows ___ property.
Discrete logarithmic
Die-Hellman
Collision free
Which of the following is a discrete logarithmic problem?
Calculate a and b, where p, g, ga and gb are given.
Calculate g, where p, a and ga are given.
Calculate a and b, where p, g, ga and gb are given.
Calculate a, where g,b are given.
If an ecient algorithm for calculating discrete log is found, Die Hellman will not be secure.
True
False
What method is often used to ensure "freshness"?
Nonce
Asymmetric ciphers
Key renegotiation
Digital signatures
Which of the following is not a desirable parameter for digital signature generation?
Public key
Signature scheme
Message to be signed
Private key
All digital signature protocols require the use of asymmetric cryptography
True
False
Symmetric cryptography is very useful for encrypting large quantities of data efficiently
True
False
"Zero Knowledge Proofs are designed to ___________________"
Allow a user to demonstrate knowledge of a secret while revelaing no information about the secret.
Prevent pre-computation on the key space, and hence reduce the likelihood of a brute force attack
Prevent replay attacks, where an attacker repeats a previously seen message without necissarily knowing the contents
Ensure that the current communication is considered "fresh"
If an ecient algorithm for integer factorisation is found, AES would be insecure.
True
False
Symmetric cryptography is very useful when creating digital signature protocols
False
True
Asymmetric cryptography is more ecient than symmetric cryptography for key management in large systems.
True
False
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