What type of attack can be used against the Diffie-Hellman key exchange?

Logjam
Logjam is a new attack against the Diffie-Hellman key-exchange protocol used in TLS. Basically: The Logjam attack allows a man-in-the-middle attacker to downgrade vulnerable TLS connections to 512-bit export-grade cryptography. This allows the attacker to read and modify any data passed over the connection.

Why is Diffie-Hellman susceptible to a person in the middle attack?

Diffie-Hellman key exchange is vulnerable to man-in-the-middle attacks because it cannot verify the identity of the other side. An attacker can intercept the key exchange, and presents as the other party to both sides, and then be able to relay the communication and even modify it however he/she likes.

What type of encryption is the Diffie-Hellman algorithm and what is it based on?

The algorithm is based on Elliptic Curve Cryptography, a method of doing public-key cryptography based on the algebra structure of elliptic curves over finite fields. The DH also uses the trapdoor function, just like many other ways to do public-key cryptography.

What is Diffie-Hellman encryption?

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.

Is Diffie-Hellman vulnerable to MitM?

No, DH is not vulnerable to MITM.

What is authenticated Diffie-Hellman key agreement?

Authenticated two-party Diffie-Hellman key exchange allows two principals A and B, communicating over a public network, and each holding a pair of matching public/private keys to agree on a session key. Protocols designed to deal with this problem ensure A (B resp.)

Is Diffie Hellman asymmetric encryption?

Diffie-Hellman: The Diffie-Hellman algorithm was one of the earliest known asymmetric key implementations. The Diffie-Hellman algorithm is mostly used for key exchange. Although symmetric key algorithms are fast and secure, key exchange is always a problem.