Tagged Questions
2
votes
1answer
102 views
Is it feasible to break Diffie-Hellman key exchange when the implementation uses a poor-quality PRNG?
I've come across an implementation of DH in Java that uses the Random class to generate the secret integer value $a$, as shown in in Wikipedia's description of the ...
0
votes
1answer
253 views
ECDH VS. DH benchmarking in JAVA
So basically my problem is the odd result i get when measuring the time it takes to generate a ECDH key in java vs. the time it takes to generate a DH key.
I compare the time it takes to generate:
...
0
votes
1answer
153 views
Ways to protect flash player against MITM diffie hellman
We have a server, which sends content encrypted with AES128 or RC4 to a flash client over an insecure HTTP channel. The encryption key is negotiated using Diffie Hellman.
The problem:
Diffie ...
6
votes
1answer
919 views
why do we need Diffie Hellman?
my question from stackoverflow: http://stackoverflow.com/questions/11374592/why-do-we-need-diffie-hellman
Diffie–Hellman offers secure key exchange only if sides are authenticated. for ...
3
votes
1answer
164 views
Does Identity-Based Encryption actually solve any problem?
Identity based encryption schemes [*] seem to have great potential in high-latency Delay-Tolerant and mobile, ad-hoc networks since they apparently seem to avoid the need for key negotiation and ...
0
votes
1answer
285 views
How do I generate a session key using the Diffie Hellman algorithm?
How to generate a session key between two nodes in two different subnets when the nodes don't know each other directly, using diffie hellman algorithm?
2
votes
1answer
207 views
Verilog simulation & synthesis of Diffie-Hellman key exchange
Is there any freely available verilog implementaion of Diffie-Hellman key exchange?
I couldn't find anything using google. So, assuming its not there I started implementing on my own.
The code is ...
3
votes
1answer
576 views
Trouble with diffie-hellman groups
Is anyone able to point me towards a known-to-be-good diffie-hellman group? I currently use group 24 (RFC5114, 2048-bit MODP Group with 256-bit Prime Order Subgroup). It came to me that this group is ...
5
votes
1answer
278 views
How should I check the received ephemeral Diffie-Hellman public keys?
In my application I'm doing a DH key exchange, where both sides generate their
own ephemeral key. No static keys are used. I am trying to make my
application resistant against an active attack and ...
4
votes
1answer
457 views
advantages of a static ECDH key
What are the advantages of using static-ephemeral ECDH over ephemeral-ephemeral ECDH?
2
votes
2answers
158 views
Is EKE attackable by a brute-force password search?
So I'm trying to properly implement the EKE protocol and I'm using C# with the Windows CNG and ECDH key exchange. I need to use this because it's FIPS certified and all that jazz.
So what I'm ...
2
votes
1answer
335 views
Generalizing the conversion of Diffie-Hellman to El Gamal
How can we generalize the conversion of Diffie-Hellman to El Gamal public-key encryption scheme? The goals is to be eventually able to show that any 2-round key-exchange protocol can be converted into ...
8
votes
3answers
2k views
Can one generalize the Diffie-Hellman key exchange to three or more parties?
Does anyone know how to do a Diffie-Hellman or ECDH key exchange with more than two parties?
I know how to do a key exchange between 2 parties, but I need to be able to have a key agreement between 3 ...
7
votes
7answers
3k views
Is Diffie-Hellman mathematically the same as RSA?
Is the Diffie-Hellman key exchange the same as RSA?
Diffie Hellman allows key exchange on a observed wire – but so can RSA.
Alice and Bob want to exchange a key – Big brother is watching everything.
...
20
votes
1answer
1k views
Does the generator size matter in Diffie-Hellman?
For the Diffie-Hellman protocol I've heard that the generator 3 is as safe as any other generator. Yet, 32-bit or 256-bit exponents are sometimes used as generators. What is the benefit of using ...
