The Diffie–Hellman key agreement is an anonymous, non-authenticated key-agreement protocol.

learn more… | top users | synonyms (1)

1
vote
1answer
31 views

Diffie-Hellman in the wild

Say we have a public network and lots of peers. Each may need to communicate with another peer. Would there be any huge security issue to each peer making the the public part of their key openly ...
4
votes
1answer
162 views

Hashing a Diffie-Hellman result

In many implementations, the result of the Diffie-Hellman algorithm is hashed. I read that: Hashing the shared secret point prevents an attacker from gaining more information about the EC private ...
5
votes
1answer
423 views

Small subgroup confinement attack on Diffie-Hellman

I am trying to understand the small subgroup confinement attack on the Diffie-Hellman algorithm. I will present the attack and try to explain why it works. Small subgroup confinement attack on the ...
-1
votes
1answer
67 views

How ECDH algorithm selects modulus value?

I am curious to know how an ECDH algorithms select a module value, if both ends A & B can generate same shared key using the public key of each other ? If I understood DH correctly, both A and B ...
2
votes
1answer
127 views

variant of Diffie–Hellman key exchange protocol

Motivation Consider the following variant of Diffie-Hellman key exchange protocol for two parties: Assume Alice and Bob share $\mathbb{G}$ of order $q$ generated by $g$ Alice samples $a$ ...
7
votes
1answer
246 views

Is SHA-1 safe for signing ECDHE parameters?

Is using the SHA-1 algorithm insecure for hashing the ephemeral ECDH public key in the signed_params structure? There are some worrying articles about using SHA-1: ...
1
vote
1answer
69 views

Factors of the group order to secure against Pohlig-Hellman

I am looking into the security of Diffie-Hellman and the discrete log in general. To make sure an attacker can not use Pohlig-Hellman to solve the discrete log quickly we need to make sure that the ...
1
vote
1answer
172 views

Proving security of TLS handshake with ProVerif

Background For my dissertation I am working on an application protocol for which I require a TLS session. I am looking to achieve Perfect Forward Secrecy, which means I have selected ephemeral Diffie-...
1
vote
1answer
93 views

ssh-keygen DH Primality Testing

I'm pretty familiar with using ssh-keygen to create groups that go in the /etc/ssh/moduli file for the Diffie-Hellman Group Exchange in openssh. Reading over the man page, it says "By default, each ...