Hashing and digital signatures

- [Instructor] A big part of working with SSL and TLS…includes hashing and digital signatures.…These are methods that fall into the big picture…of securing network communications.…Let's define how that works.…We'll start by talking about hashing.…Hashing doesn't necessarily require a PKI certificate…and it might not even be used for network communications.…However, it can be.…So it can be used to verify…the integrity of network messages,…or simply the integrity of files that are stored somewhere.…

And also to verify machine boot-up settings.…When we say verify the integrity, what we mean is…we want to make sure that these things…have not been tampered with, they've not been modified…by unauthorized parties.…So hashing then doesn't provide data confidentiality…that would be encryption.…Hashing can also be used with SSL and TLS…and we'll identify that a little bit later…when we talk about digital signatures.…Hashing uses a one-way algorithm that results…in a unique value and that unique value…is called a hash or a message digest.…