After completing this video, the learner will understand how the Data Encryption Standard (DES) implements encryption and decryption as well as the flaws in this approach.
- [Voiceover] Modern symmetric algorithm's are much more…complex, than the simple substitution and…transposition ciphers of years past.…One of the most well known symmetric algorithm's is…the data encryption standard or D.E.S.…D.E.S is a historic encryption algorithm designed and…implemented by IBM in the 1970's.…With a purpose of serving as a standard encryption algorithm…for unclassified communication throughout…the federal government.…
Up until that point, different agencies used different…encryption algorithms, this caused issues with both…security because all of those algorithms weren't…thoroughly tested and interoperability, because…different agencies couldn't easily communicate with…each other in a secure manner.…Let's dig in to how D.E.S works, because it serve's as a…great example of the complexity of…modern cryptographic algorithms.…This picture shows the basic functioning of D.E.S.…
It takes 64-bit's of plain text as input in the top and…then runs it through an encryption operation known as the…feistel function.…
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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