Diffie-Hellman Key Exchange?
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Questions and Answers

Which problem is the Diffie-Hellman key exchange method based on?

  • The quadratic residue problem
  • The Euclidean algorithm problem
  • The prime factorization problem
  • The discrete logarithm problem (correct)

What is the purpose of the Diffie-Hellman key exchange method?

  • To agree on a secret key over an insecure channel (correct)
  • To decrypt messages
  • To authenticate users
  • To encrypt messages

What is the role of the prime number p in the Diffie-Hellman key exchange method?

  • It is used to compute the shared secret key
  • It is a primitive root modulo p (correct)
  • It is Alice's private key
  • It is Bob's public key

What is the recommended size for the prime number p in the Diffie-Hellman key exchange method?

<p>2048 bits (C)</p> Signup and view all the answers

What is the main attack that can compromise the security of the Diffie-Hellman key exchange method?

<p>Discrete logarithm attack (B)</p> Signup and view all the answers

What is the difference between static and ephemeral Diffie-Hellman key exchange?

<p>Static uses the same keys for many sessions, while ephemeral changes keys for each session (A)</p> Signup and view all the answers

What is the advantage of using ephemeral Diffie-Hellman key exchange?

<p>It offers forward secrecy (A)</p> Signup and view all the answers

What is the disadvantage of using RSA keys for key exchange?

<p>They do not offer forward secrecy (B)</p> Signup and view all the answers

What is the role of the integer g in the Diffie-Hellman key exchange method?

<p>It is a primitive root modulo p (A)</p> Signup and view all the answers

What is the purpose of using large prime factors for p-1 in the Diffie-Hellman key exchange method?

<p>To make key exchange more secure (B)</p> Signup and view all the answers

What is the advantage of using static Diffie-Hellman key exchange?

<p>It is more secure than ephemeral key exchange (C)</p> Signup and view all the answers

What is the purpose of the Diffie-Hellman key exchange method?

<p>To agree on a secret key over an insecure channel (A)</p> Signup and view all the answers

Which problem is the Diffie-Hellman key exchange method based on?

<p>The discrete logarithm problem (C)</p> Signup and view all the answers

What is the purpose of the Diffie-Hellman key exchange method?

<p>To agree on a secret key over an insecure channel (B)</p> Signup and view all the answers

What is the role of the prime number p in the Diffie-Hellman key exchange method?

<p>It is a primitive root modulo p (D)</p> Signup and view all the answers

What is the recommended size for the prime number p in the Diffie-Hellman key exchange method?

<p>2048 bits (C)</p> Signup and view all the answers

What is the main attack that can compromise the security of the Diffie-Hellman key exchange method?

<p>Discrete logarithm attack (A)</p> Signup and view all the answers

What is the difference between static and ephemeral Diffie-Hellman key exchange?

<p>Static uses the same keys for many sessions, while ephemeral changes keys for each session (D)</p> Signup and view all the answers

What is the advantage of using ephemeral Diffie-Hellman key exchange?

<p>It offers forward secrecy (D)</p> Signup and view all the answers

What is the disadvantage of using RSA keys for key exchange?

<p>They do not offer forward secrecy (B)</p> Signup and view all the answers

What is the role of the integer g in the Diffie-Hellman key exchange method?

<p>It is a primitive root modulo p (C)</p> Signup and view all the answers

What is the purpose of using large prime factors for p-1 in the Diffie-Hellman key exchange method?

<p>To make key exchange more secure (C)</p> Signup and view all the answers

What is the advantage of using static Diffie-Hellman key exchange?

<p>It is more secure than ephemeral key exchange (C)</p> Signup and view all the answers

What is the purpose of the Diffie-Hellman key exchange method?

<p>To agree on a secret key over an insecure channel (C)</p> Signup and view all the answers

Which two individuals invented the Diffie-Hellman Key Exchange method?

<p>Whitfield Diffie and Martin Hellman (A)</p> Signup and view all the answers

What is the purpose of the Diffie-Hellman Key Exchange method?

<p>To agree on a secret key over an insecure channel (D)</p> Signup and view all the answers

What is the main attack that can compromise the security of the Diffie-Hellman Key Exchange method?

<p>Discrete logarithm attack (D)</p> Signup and view all the answers

What does Alice choose in the key generation process of the Diffie-Hellman Key Exchange method?

<p>A secret integer a (B)</p> Signup and view all the answers

What does Bob choose in the key generation process of the Diffie-Hellman Key Exchange method?

<p>A secret integer b (B)</p> Signup and view all the answers

What does Alice compute in the key generation process of the Diffie-Hellman Key Exchange method?

<p>ga mod p (B)</p> Signup and view all the answers

What does Bob compute in the key generation process of the Diffie-Hellman Key Exchange method?

<p>gb mod p (C)</p> Signup and view all the answers

What does Alice send to Bob in the Diffie-Hellman Key Exchange method?

<p>x = ga mod p (C)</p> Signup and view all the answers

What does Bob send to Alice in the Diffie-Hellman Key Exchange method?

<p>Another integer g which is primitive modulo p (B)</p> Signup and view all the answers

What does Alice compute to obtain the secret key in the Diffie-Hellman Key Exchange method?

<p>ya mod p (B)</p> Signup and view all the answers

What does Bob compute to obtain the secret key in the Diffie-Hellman Key Exchange method?

<p>xb mod p (A)</p> Signup and view all the answers

What is the recommended minimum number of bits for the prime p in the Diffie-Hellman Key Exchange method?

<p>2048 bits (C)</p> Signup and view all the answers

What is the security risk of using a small prime number p in the Diffie-Hellman key exchange method?

<p>The discrete logarithm problem can be efficiently solved, compromising the security of the system.</p> Signup and view all the answers

What is the significance of a safe prime and a Sophie Germain prime in the Diffie-Hellman key exchange method?

<p>They provide added security to the system by ensuring that p-1 has a large prime factor.</p> Signup and view all the answers

What is the Logjam attack and what is its impact on the security of the Diffie-Hellman key exchange method?

<p>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.</p> Signup and view all the answers

What is the recommended size for p in the Diffie-Hellman key exchange method according to IETF standard RFC7919?

<p>At least 2048 bits.</p> Signup and view all the answers

What is forward secrecy in the context of the Diffie-Hellman key exchange method?

<p>Forward secrecy is the property of a system that ensures compromised private keys in the future cannot be used to compromise past sessions.</p> Signup and view all the answers

What is the difference between static and ephemeral Diffie-Hellman key exchange?

<p>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.</p> Signup and view all the answers

What is the advantage of using ephemeral Diffie-Hellman key exchange?

<p>Ephemeral Diffie-Hellman key exchange provides forward secrecy, ensuring that past sessions are protected even if private keys are compromised in the future.</p> Signup and view all the answers

What is the disadvantage of using RSA keys for key exchange?

<p>RSA keys do not provide forward secrecy, so past sessions are compromised if a private key is compromised in the future.</p> Signup and view all the answers

What is the role of the integer g in the Diffie-Hellman key exchange method?

<p>g is a primitive modulo p and is used in the computation of x and y.</p> Signup and view all the answers

What is the discrete logarithm problem and how is it related to the security of the Diffie-Hellman key exchange method?

<p>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.</p> Signup and view all the answers

What is the significance of using large prime factors for p-1 in the Diffie-Hellman key exchange method?

<p>Using large prime factors for p-1 makes the discrete logarithm problem harder to solve, increasing the security of the system.</p> Signup and view all the answers

What is the purpose of the Diffie-Hellman key exchange method in cryptography?

<p>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.</p> Signup and view all the answers

What is the significance of the discrete logarithm problem in the security of the Diffie-Hellman key exchange method?

<p>If the discrete logarithm problem can be efficiently solved, Eve can compute the shared secret key between Alice and Bob.</p> Signup and view all the answers

What is the recommended size for the prime number p in the Diffie-Hellman key exchange method?

<p>At least 2048 bits.</p> Signup and view all the answers

What is a safe prime in the context of the Diffie-Hellman key exchange method?

<p>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.</p> Signup and view all the answers

What is the Sophie Germain prime in the context of the Diffie-Hellman key exchange method?

<p>The prime number q in a safe prime p-1 = 2q.</p> Signup and view all the answers

What is the Logjam attack and what is its impact on the security of the Diffie-Hellman key exchange method?

<p>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.</p> Signup and view all the answers

What is the IETF standard for the Diffie-Hellman key exchange method and what does it provide?

<p>The IETF standard RFC7919 provides recommended values for p and g to enhance security of the method.</p> Signup and view all the answers

What is forward secrecy in the context of the Diffie-Hellman key exchange method?

<p>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.</p> Signup and view all the answers

What is the difference between static and ephemeral Diffie-Hellman key exchange?

<p>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.</p> Signup and view all the answers

What is the advantage of using ephemeral Diffie-Hellman key exchange?

<p>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.</p> Signup and view all the answers

What is the disadvantage of using RSA keys for key exchange?

<p>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.</p> Signup and view all the answers

What is the role of the integer g in the Diffie-Hellman key exchange method?

<p>The integer g is a primitive root modulo p and serves as a generator of the group of integers modulo p.</p> Signup and view all the answers

What is the purpose of using large prime factors for p-1 in the Diffie-Hellman key exchange method?

<p>Using large prime factors for p-1 makes the discrete logarithm problem harder to solve, which enhances the security of the method.</p> Signup and view all the answers

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