Cryptography

- [Instructor] In order to help understand … how encryption works … within a server system, … you need to first understand … a very basic concept called cryptography. … Now, to put a very simple definition … on this word cryptography, … we're going to say that it's the concept … of applying an algorithm to plaintext … in order to convert it over into ciphertext. … So what do we mean by that? … Well, I have an example here for you. … Let's say we have an algorithm that says go up two letters, … and let's say we have the word sample … which is just in plaintext, right, just sample. … We can read that easy. … What we do is we take each letter … and we increase by two letters. … So if we take the letter s in sample, … and we go up two letters, … you go s, t, u, right, that's two letters, … so you put a u where the s is. … Take the a, go up two letters, b, c. … You put a c where the a is, … and we could continue through this process … and you'll see that the word sample becomes the word, …