After completing this video, the learner will understand the process of key exchange, including the difference between in-band and out-of-band key exchange.
- [Voiceover] As we've already discussed,…every encryption algorithm relies upon the use of…encryption and decryption keys.…And it is critical to keep some of those keys secret.…In the case of symmetric encryption,…the sender and receiver share a single secret key…that nobody else should know.…Before the sender and receiver can begin to communicate…using a symmetric algorithm,…they must somehow agree upon and exchange…the shared secret key that they will use…for that communication session.…
If you stop and think about it for a moment,…this can be a real challenge.…Let's say that Alice and Bob would like the ability…to communicate secretly with each other.…They hope to achieve two of the goals of cryptography:…confidentiality for their communications,…and an assurance of authentication…that they are really talking to each other.…So how can they exchange an encryption key?…Alice might go ahead and randomly select her secret key,…which is fine,…but then she has to somehow send it to Bob.…She doesn't yet have a secure channel to communicate…
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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