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. In this video, learn about the process of key exchange, including the difference between in-band and out-of-band key exchange.
- [Instructor] 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 insurance of authentication…that they are really talking to each other.…So how can the 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…
Members who take all eight courses in the series will be prepared to take and pass the CISSP exam. Find the companion study books at the Sybex test prep site and review the complete CISSP Body of Knowledge at https://www.isc2.org/cissp-domains/default.aspx.
- Understanding security and evaluation models
- Cloud computing and virtualization
- Securing hardware
- Client and server vulnerabilities
- Web security vulnerabilities
- Securing mobile and smart devices
- Understanding encryption
- Key management and public key infrastructure
- Physical security
Skill Level Advanced
1. Security Engineering
2. Cloud Computing and Virtualization
3. Hardware Security
4. Client and Server Vulnerabilities
5. Web Security
6. Mobile Security
7. Smart Device Security
9. Symmetric Cryptography
10. Asymmetric Cryptography
11. Key Management
12. Public Key Infrastructure
13. Cryptanalytic Attacks
14. Physical Security
- Mark as unwatched
- Mark all as unwatched
Are you sure you want to mark all the videos in this course as unwatched?
This will not affect your course history, your reports, or your certificates of completion for this course.Cancel
Take notes with your new membership!
Type in the entry box, then click Enter to save your note.
1:30Press on any video thumbnail to jump immediately to the timecode shown.
Notes are saved with you account but can also be exported as plain text, MS Word, PDF, Google Doc, or Evernote.