Diffie-Hellman Key Exchange?

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

<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

<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

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

<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

<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

<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

<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

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

<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

<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

<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

<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

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

<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

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

<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

<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

<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

<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

<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

<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

<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

<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