After completing this video, the learner will understand the hashing algorithms used in the public key infrastructure, including MD5, SHA, RIPEMD and HMAC.
- [Voiceover] Hash functions are extremely important…to the use of public key cryptography,…and, in particular, to the creation of digital certificates…and digital signatures.…Let me start by giving you the technical definition…of a hash function,…and then I'll explain it to you piece by piece.…A hash function is a one-way function…that transforms a variable length…input into a unique fixed-length output.…So let's pick apart that definition.…Hash functions are one-way functions.…
That means that you can't reverse the process of hashing.…If you have content, you can use a hash function…to calculate the hash value of that content,…but you can't go the other way around.…If you have a hash value, you can't use it to…figure out the original content,…unless you already have a copy of that text.…Hash functions map variable-length input…to fixed-length outputs.…That simply means you can send input…of any length to a hash function…and the hashes that it produces…will always be the same length.…
Feed in two words, or an entire book,…
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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