After completing this video, the learner will understand different trust models, including personal knowledge, the web of trust and the public key infrastructure.
- [Voiceover] Any cryptographic system…depends upon some degree of trust.…Earlier in this course, I discussed how strong cryptography…depends upon a secure key exchange process.…The two people communicating must be confident…that they are really communicating with each other…and not an impersonator,…and that nobody is going to be able to eavesdrop on the…communication where they exchange encryption keys.…The Diffie Hellman key exchange protocol…helps us with preventing eavesdropping,…but we still require some way to ensure…that we're not communicating with an impostor.…
In assymetric cryptography,…every use possesses a personal secret key…that they don't need to share with anyone else.…They can also share their public keys freely…so that there's no risk of eavesdropping.…These two factors combine…to eliminate the need for eavesdropping protection…during key exchange.…However, we do still need to worry about impostors.…How do we know that the person sending us their public key…really is who they claim to be?…There are three basic ways…
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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