60 Questions
Which problem is the Diffie-Hellman key exchange method based on?
The discrete logarithm problem
What is the purpose of the Diffie-Hellman key exchange method?
To agree on a secret key over an insecure channel
What is the role of the prime number p in the Diffie-Hellman key exchange method?
It is a primitive root modulo p
What is the recommended size for the prime number p in the Diffie-Hellman key exchange method?
2048 bits
What is the main attack that can compromise the security of the Diffie-Hellman key exchange method?
Discrete logarithm attack
What is the difference between static and ephemeral Diffie-Hellman key exchange?
Static uses the same keys for many sessions, while ephemeral changes keys for each session
What is the advantage of using ephemeral Diffie-Hellman key exchange?
It offers forward secrecy
What is the disadvantage of using RSA keys for key exchange?
They do not offer forward secrecy
What is the role of the integer g in the Diffie-Hellman key exchange method?
It is a primitive root modulo p
What is the purpose of using large prime factors for p-1 in the Diffie-Hellman key exchange method?
To make key exchange more secure
What is the advantage of using static Diffie-Hellman key exchange?
It is more secure than ephemeral key exchange
What is the purpose of the Diffie-Hellman key exchange method?
To agree on a secret key over an insecure channel
Which problem is the Diffie-Hellman key exchange method based on?
The discrete logarithm problem
What is the purpose of the Diffie-Hellman key exchange method?
To agree on a secret key over an insecure channel
What is the role of the prime number p in the Diffie-Hellman key exchange method?
It is a primitive root modulo p
What is the recommended size for the prime number p in the Diffie-Hellman key exchange method?
2048 bits
What is the main attack that can compromise the security of the Diffie-Hellman key exchange method?
Discrete logarithm attack
What is the difference between static and ephemeral Diffie-Hellman key exchange?
Static uses the same keys for many sessions, while ephemeral changes keys for each session
What is the advantage of using ephemeral Diffie-Hellman key exchange?
It offers forward secrecy
What is the disadvantage of using RSA keys for key exchange?
They do not offer forward secrecy
What is the role of the integer g in the Diffie-Hellman key exchange method?
It is a primitive root modulo p
What is the purpose of using large prime factors for p-1 in the Diffie-Hellman key exchange method?
To make key exchange more secure
What is the advantage of using static Diffie-Hellman key exchange?
It is more secure than ephemeral key exchange
What is the purpose of the Diffie-Hellman key exchange method?
To agree on a secret key over an insecure channel
Which two individuals invented the Diffie-Hellman Key Exchange method?
Whitfield Diffie and Martin Hellman
What is the purpose of the Diffie-Hellman Key Exchange method?
To agree on a secret key over an insecure channel
What is the main attack that can compromise the security of the Diffie-Hellman Key Exchange method?
Discrete logarithm attack
What does Alice choose in the key generation process of the Diffie-Hellman Key Exchange method?
A secret integer a
What does Bob choose in the key generation process of the Diffie-Hellman Key Exchange method?
A secret integer b
What does Alice compute in the key generation process of the Diffie-Hellman Key Exchange method?
ga mod p
What does Bob compute in the key generation process of the Diffie-Hellman Key Exchange method?
gb mod p
What does Alice send to Bob in the Diffie-Hellman Key Exchange method?
x = ga mod p
What does Bob send to Alice in the Diffie-Hellman Key Exchange method?
Another integer g which is primitive modulo p
What does Alice compute to obtain the secret key in the Diffie-Hellman Key Exchange method?
ya mod p
What does Bob compute to obtain the secret key in the Diffie-Hellman Key Exchange method?
xb mod p
What is the recommended minimum number of bits for the prime p in the Diffie-Hellman Key Exchange method?
2048 bits
What is the security risk of using a small prime number p in the Diffie-Hellman key exchange method?
The discrete logarithm problem can be efficiently solved, compromising the security of the system.
What is the significance of a safe prime and a Sophie Germain prime in the Diffie-Hellman key exchange method?
They provide added security to the system by ensuring that p-1 has a large prime factor.
What is the Logjam attack and what is its impact on the security of the Diffie-Hellman key exchange method?
Logjam attack is an attack that can break 512-bit keys with sufficient precomputation, and 1024-bit keys are within reach for extremely powerful computers. It compromises the security of the system.
What is the recommended size for p in the Diffie-Hellman key exchange method according to IETF standard RFC7919?
At least 2048 bits.
What is forward secrecy in the context of the Diffie-Hellman key exchange method?
Forward secrecy is the property of a system that ensures compromised private keys in the future cannot be used to compromise past sessions.
What is the difference between static and ephemeral Diffie-Hellman key exchange?
Static Diffie-Hellman key exchange uses the same keys for a long time, while ephemeral Diffie-Hellman key exchange uses different keys for each session.
What is the advantage of using ephemeral Diffie-Hellman key exchange?
Ephemeral Diffie-Hellman key exchange provides forward secrecy, ensuring that past sessions are protected even if private keys are compromised in the future.
What is the disadvantage of using RSA keys for key exchange?
RSA keys do not provide forward secrecy, so past sessions are compromised if a private key is compromised in the future.
What is the role of the integer g in the Diffie-Hellman key exchange method?
g is a primitive modulo p and is used in the computation of x and y.
What is the discrete logarithm problem and how is it related to the security of the Diffie-Hellman key exchange method?
The discrete logarithm problem is the problem of finding x in the equation g^x mod p = y, given g, p, and y. The security of the Diffie-Hellman key exchange method is based on the difficulty of the discrete logarithm problem.
What is the significance of using large prime factors for p-1 in the Diffie-Hellman key exchange method?
Using large prime factors for p-1 makes the discrete logarithm problem harder to solve, increasing the security of the system.
What is the purpose of the Diffie-Hellman key exchange method in cryptography?
The purpose of the Diffie-Hellman key exchange method is to allow two parties to agree on a secret key over an insecure channel without revealing the key to eavesdroppers.
What is the significance of the discrete logarithm problem in the security of the Diffie-Hellman key exchange method?
If the discrete logarithm problem can be efficiently solved, Eve can compute the shared secret key between Alice and Bob.
What is the recommended size for the prime number p in the Diffie-Hellman key exchange method?
At least 2048 bits.
What is a safe prime in the context of the Diffie-Hellman key exchange method?
A prime p such that p-1 = 2q, where q is also a prime. It is recommended that p is a safe prime to enhance security.
What is the Sophie Germain prime in the context of the Diffie-Hellman key exchange method?
The prime number q in a safe prime p-1 = 2q.
What is the Logjam attack and what is its impact on the security of the Diffie-Hellman key exchange method?
Logjam attack is an attack that can break the security of the Diffie-Hellman key exchange method by precomputing a large amount of data. It can break 512 bit keys and potentially 1024 bit keys. It raises concern about the security of the method in practice.
What is the IETF standard for the Diffie-Hellman key exchange method and what does it provide?
The IETF standard RFC7919 provides recommended values for p and g to enhance security of the method.
What is forward secrecy in the context of the Diffie-Hellman key exchange method?
Forward secrecy is the property that ensures the security of past communication sessions even if the private keys of the parties are compromised in the future. Ephemeral Diffie-Hellman key exchange provides forward secrecy.
What is the difference between static and ephemeral Diffie-Hellman key exchange?
Static Diffie-Hellman key exchange uses the same keys for multiple sessions, while in Ephemeral Diffie-Hellman key exchange, a new set of keys is generated for each session.
What is the advantage of using ephemeral Diffie-Hellman key exchange?
Ephemeral Diffie-Hellman key exchange provides forward secrecy, which ensures the security of past sessions even if the private keys are compromised in the future.
What is the disadvantage of using RSA keys for key exchange?
RSA keys do not provide forward secrecy. If a private key is compromised in the future, all the past sessions that used that key are also compromised.
What is the role of the integer g in the Diffie-Hellman key exchange method?
The integer g is a primitive root modulo p and serves as a generator of the group of integers modulo p.
What is the purpose of using large prime factors for p-1 in the Diffie-Hellman key exchange method?
Using large prime factors for p-1 makes the discrete logarithm problem harder to solve, which enhances the security of the method.
Test your knowledge on the Diffie-Hellman Key Exchange, a pioneering cryptographic method invented by Diffie and Hellman in 1976. This quiz will cover the basics of how two parties can securely agree on a secret key over an insecure channel, including key generation, the discrete logarithm problem, and the mathematical concepts behind the algorithm. Whether you're a cryptography enthusiast or just curious about this groundbreaking technology, this quiz is sure to challenge and inform you.
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