DH or RSA for encryption: which makes better sense?

Asked By Barb Brennan 20 points N/A Posted on - 12/06/2014

What is Diffie-Hellman? What is it used for? How is it different from the encryption methodology used in RSA? What is the Diffie Helman key vulnerable to? Is there any reason why it should be preferred over the RSA method? In what circumstances could one chose to use RSA over the Diffie Hellman method?

 

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Answered By Sharath Reddy 590495 points N/A #152216

DH or RSA for encryption: which makes better sense?

The Diffie-Hellman key exchange is a precise technique of exchanging cryptographic keys securely over a public channel. It was originally conceived by Ralph Merkle and was the original definite example of public-key cryptography. Other term called for Diffie-Hellman key exchange is exponential key exchange. It is a process of digital encryption that utilizes a number raised to particular powers to create decryption keys.

The created decryption keys are in no way directly transmitted. The gravest constraint of Diffie-Hellman in its pure form is the lack of authentication or verification. Communications established with Diffie-Hellman are susceptible to “man in the middle” attacks. Supposedly, the application of Diffie-Hellman should be in combination with a known authentication method like digital signatures to confirm the identities of the users.

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• Posted on - 12/07/2014
• Question Category: Misc Security