## What is Diffie-Hellman key exchange algorithm with example?

The Diffie–Hellman (DH) Algorithm is a key-exchange protocol that enables two parties communicating over public channel to establish a mutual secret without it being transmitted over the Internet. DH enables the two to use a public key to encrypt and decrypt their conversation or data using symmetric cryptography.

## Where is Diffie Hellman algorithm used?

The Diffie-Hellman algorithm will be used to establish a secure communication channel. This channel is used by the systems to exchange a private key. This private key is then used to do symmetric encryption between the two systems. RSA: It is the Rivest Shamir Adelman algorithm.

**What is advantage of Diffie-Hellman key exchange algorithm?**

Advantages of the Diffie Hellman Algorithm The sender and receiver don’t need any prior knowledge of each other. Once the keys are exchanged, the communication of data can be done through an insecure channel. The sharing of the secret key is safe.

### What is Diffie-Hellman moduli?

Diffie-Hellman—A public-key cryptography protocol that allows two parties to establish a shared secret over an unsecure communications channel. Diffie-Hellman is used within IKE to establish session keys. It supports 768-bit (the default), 1024-bit, 1536-bit, 2048-bit, 3072-bit, and 4096-bit DH groups.

### What are Diffie-Hellman groups?

Diffie-Hellman (DH) groups determine the strength of the key used in the key exchange process. Within a group type (MODP or ECP), higher Diffie-Hellman group numbers are usually more secure.

**What are the Diffie-Hellman groups?**

About Diffie-Hellman Groups

- Diffie-Hellman Group 1 (768-bit)
- Diffie-Hellman Group 2 (1024-bit)
- Diffie-Hellman Group 5 (1536-bit)
- Diffie-Hellman Group 14 (2048-bit)
- Diffie-Hellman Group 15 (3072-bit)

#### Does RSA use Diffie-Hellman?

RSA permits digital signatures, a key differentiator from the Diffie-Hellman approach. Although both the Diffie-Hellman Key Exchange and RSA are the most popular encryption algorithms, RSA tends to be more popular for securing information on the internet.

#### Is RSA a Diffie-Hellman?

The asymmetric key includes many cryptographic algorithms. Both Diffie- Hellman Key Exchange and RSA have advantages and disadvantages….Diffie- Hellman Key Exchange Vs. RSA.

Parameters | RSA | Diffie-Hellman (DH) Key Exchange |
---|---|---|

Forward Secrecy | RSA doesn’t provide perfect forward secrecy. | Forward secrecy is in DH key exchange. |

**What is the major problem with Diffie-Hellman key exchange algorithm explain?**

The most serious limitation of Diffie-Hellman in its basic or “pure” form is the lack of authentication. Communications using Diffie-Hellman all by itself are vulnerable to man in the middle attacks.

## What is Diffie-Hellman and RSA?

In a nutshell, Diffie Hellman approach generates a public and private key on both sides of the transaction, but only shares the public key. Unlike Diffie-Hellman, the RSA algorithm can be used for signing digital signatures as well as symmetric key exchange, but it does require the exchange of a public key beforehand.

## What is Diffie-Hellman Group 2?

You specify the Diffie-Hellman group in Phase 2 only when you select Perfect Forward Secrecy (PFS). PFS makes keys more secure because new keys are not made from previous keys. If a key is compromised, new session keys are still secure.

**What are the disadvantages of the Diffie Hellman algorithm?**

Disadvantages of the Diffie Hellman Algorithm 1 The algorithm can not be sued for any asymmetric key exchange. 2 Similarly, it can not be used for signing digital signatures. 3 Since it doesn’t authenticate any party in the transmission, the Diffie Hellman key exchange is susceptible to a man-in-the-middle attack.

### How is the Diffie-Hellman key exchange protocol implemented?

The Diffie–Hellman Key Exchange protocol can be implemented using discrete logarithms (the classical DHKE algorithm) or using elliptic-curve cryptography (the ECDH algorithm).

### Which is the first public key exchange protocol?

DHKE was one of the first public-key protocols, which allows two parties to exchange data securely, so that is someone sniffs the communication between the parties, the information exchanged can be revealed.

**Which is Better ECC or non-ECC cryptography?**

ECC requires a smaller key as compared to non-ECC cryptography to provide equivalent security (a 256-bit ECC security has equivalent security attained by 3072-bit RSA cryptography). For a better understanding of Elliptic Curve Cryptography, it is very important to understand the basics of the Elliptic Curve.