Diffie-hellman key exchange problems

1. What are the problems in Diffie-Hellman key exchange?
2. What problem does the Diffie-Hellman DH algorithm solve?
3. What is the limitation of Diffie-Hellman key exchange algorithm?
4. Why is Diffie-Hellman not used?
5. What are the two major problems with symmetric key cryptography?
6. Why is Diffie-Hellman better than RSA?
7. Can Diffie-Hellman be broken by a quantum computer?
8. Can Diffie-Hellman be cracked?
9. What is the security threat of the Diffie-Hellman?
10. What is the biggest problem with symmetric key encryption?
11. What are two 2 drawbacks to using symmetric key encryption?
12. Which is the largest disadvantage of the symmetric key encryption?
13. What are the limitations of DES algorithm?
14. Which of the following are limitations of algorithm?
15. What are the limitations of asymmetric encryption?
16. What is the main vulnerability of DES?
17. Is DES encryption weak?
18. What is the disadvantage of data encryption?

What are the problems in Diffie-Hellman key exchange?

The major issue is exchanging the secret key between the sender and the receiver. Attackers might intrude and know the secret key while exchanging it.

What problem does the Diffie-Hellman DH algorithm solve?

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.

What is the limitation of Diffie-Hellman key exchange algorithm?

Limitations of Diffie-Hellman

It cannot be used for asymmetric exchange. It cannot be used to encrypt messages.

Why is Diffie-Hellman not used?

Vulnerabilities of Diffie-Hellman key exchange

Diffie-Hellman key exchange is also vulnerable to logjam attacks, specifically against the TLS protocol. Logjam attacks downgrade TLS connections to 512-bit cryptography, enabling an attacker to read and modify data that's passed through the connection.

What are the two major problems with symmetric key cryptography?

One big issue with using symmetric algorithms is the key exchange problem, which can present a classic catch-22. The other main issue is the problem of trust between two parties that share a secret symmetric key.

Why is Diffie-Hellman better than RSA?

RSA is used to exchange keys for asymmetric encryption while Diffie-Hellman is used for sharing the keys for symmetric encryption. Ephemeral Keys: Generating keys for each and every session(Ephemeral keys) in RSA is extremely difficult opposed to Diffie-Hellman, which provides an extremely easy generation of keys.

Can Diffie-Hellman be broken by a quantum computer?

And, it turns out that solving factoring and discrete logarithms (and therefore breaking RSA, Diffie-Hellman and Elliptic-Curve public-key algorithms) are not hard for such machines. Stated differently, all three of these algorithms are broken by a quantum computer of sufficient size.

Can Diffie-Hellman be cracked?

To attack a Diffie-Hellman key exchange, one could extract the secret key a from one of the peer's public key ya = g a (mod p). One could then compute the shared key g ab (mod p) using the other peer's public key yb = g b (mod p). This would work, however it requires to isolate the exponent from the formula to work.

What is the security threat of the Diffie-Hellman?

Security Threat of the Diffie-Hellman

If p and g have thousands of bits, then the best-known algorithms to compute discrete logs, although faster than plain brute force, will still take millions of years to compute. Even with its immunity to brute force, it's vulnerable to MITM (man in the middle position).

What is the biggest problem with symmetric key encryption?

While symmetric encryption offers a wide range of benefits, there is one major disadvantage associated with it: the inherent problem of transmitting the keys used to encrypt and decrypt data. When these keys are shared over an unsecured connection, they are vulnerable to being intercepted by malicious third parties.

What are two 2 drawbacks to using symmetric key encryption?

Symmetric key encryption has two drawbacks. The secret has to be communicated in a secure method and there must be a unique secret between each originator and receiver.

Which is the largest disadvantage of the symmetric key encryption?

By far the biggest disadvantage of symmetric encryption is its use of a single, secret cryptographic key to encrypt and decrypt information.

What are the limitations of DES algorithm?

The disadvantages are as follows:

Probably the biggest disadvantage of the DES algorithm is the key size of 56-bit. There are chips available that can encrypt and decrypt a million DES operations in a second. A DES cracking machine that can search all the keys in about seven hours is available for $1 million.

Which of the following are limitations of algorithm?

5.1 LIMITATIONS OF ALGORITHM POWER

Some problems cannot be solved by any algorithm. Other problems can be solved algorithmically but not in polynomial time. And even when a problem can be solved in polynomial time by some algorithms, there are usually lower bounds on their efficiency.

What are the limitations of asymmetric encryption?

Disadvantages of asymmetric cryptography include: It's a slow process compared to symmetric cryptography. Therefore, it's not appropriate for decrypting bulk messages. If an individual loses his private key, he can't decrypt the messages he receives.

What is the main vulnerability of DES?

1- Brute Force Attack

The number of possibilities is determined by the keys size in bits, since DES only has a 64 bit key, the number of combinations is rather small and a personal computer can break it in a few days. This was the main reason why DES lost its credibility and began not to be used.

Is DES encryption weak?

DES encryption uses a 56-bit key to encrypt the content and is now considered to be highly insecure.

What is the disadvantage of data encryption?

Disadvantages of Encryption

In some cases, Encryption prevents the data's actual owner to access data. Key management is one of the biggest challenges in the encryption process. Access to encryption keys needs to be given only to those users who need it.