After completing this video, the learner will understand how to strengthen DES through the use of Triple DES (3DES)
- [Voiceover] When researchers discovered…attacks on DES that rendered…the decades-old algorithm insecure,…security professionals faced a dilemma.…They had tons of old equipment designed to work with DES…but were no longer able to rely on its security.…While the government worked to adopt…the new advanced encryption standard, AES,…which I'll cover in the next video,…practical security professionals around the world…discovered a workaround.…By using the DES algorithm on…the same text multiple times,…they could achieve greater security.…
Specifically, three rounds of DES encryption…produces much stronger security…than existed with standard DES.…They called this approach Triple DES,…sometimes written as Three DES.…Here's how Triple DES works.…The person encrypting a message…feeds it into the DES algorithm…using the first key, K1.…This produces cipher text encrypted…with the standard DES algorithm.…
The sender of the message then takes this output,…feeds it into the DES algorithm again,…this time using Key Two, producing a second cipher text…
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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