After completing this video, the learner will understand how the Diffie-Hellman and Elliptic Curve Diffie Hellman algorithms allow for secure in-band key exchange.
- [Voiceover] The Diffie-Hellman Key Exchange algorithm…solves the problem of key exchange for symmetric algorithms.…The Diffie-Hellman algorithm was invented in 1976…by three cryptographers.…It was based upon the work of Ralph Merkle…and turned into a practical algorithm…by Whitfield Diffie and Martin Hellman.…Unfortunately for Merckle, his name was never included…in the popular name used for the algorithm…and we're left with the Diffie-Hellman algorithm.…I'm going to show you how…Diffie-Hellman works mathematically…but first I want to use an analogy…to share the purpose of the algorithm…using colors instead of numbers.…
It makes the concept a little easier to understand.…Let's say that Alice and Bob would like to agree on…a common shared secret color…that they don't want other people to know.…Here's one way they might do that.…First, Alice sends a message to Bob,…telling him a common color that they might use.…Let's say that Alice selects yellow…and tells Bob that color by email.…Next, Alice and Bob each select a secret color of paint…
This course is part of a six-course series on the CompTIA Security+ exam, and is useful for IT professionals who wish to learn more about information security as well as students preparing to take the Security+ exam.
We are now a CompTIA Content Publishing Partner. As such, we are able to offer CompTIA exam vouchers at a 10% discount. For more information on how to obtain this discount, please download these PDF instructions.
- Choosing encryption algorithms
- Applying symmetric and asymmetric cryptography standards
- Implementing key management, including key exchange and key stretching
- Working with public keys, trust models, and digital certificates
- Using transport encryption protocols
- Securing wireless networks
Skill Level Intermediate
2. Symmetric Cryptography
3. Asymmetric Cryptography
4. Key Management
5. Public Key Infrastructure
6. Transport Encryption
7. Wireless Security
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