For those of you who didn't watch my first course, which is cryptography for beginners with open SSL, which is recommended, you can find open SSL command line or Chilcott at the open SSL dot orgy where you will find downloads for most major platforms out there, Windows, Linux, Mac, I'm using a Mac terminal. Let's see where open SSL is located. All right. Open SSL is a cryptographic library and open source where you can do just about anything that deals with encryption, hashing, and so on. You can create your own certificate request, you can encrypt files using different cipher algorithms. You can calculate the hash value of any fine using a different hash function.

Now when we say cryptography, we actually mean cryptology. cryptology as a tree divides into two major branches. The first one is cryptography, which divides into the symmetric encryption, which is the focus of this course. And the asymmetric encryption which involves public and private keys. The second branch is crypto analysis, where mostly hackers but also scientists and mathematics mathematicians work to find patterns or doing frequency analysis to find the key that is used during the encryption As I said, this course will focus on the encryption on the symmetric encryption part. Let's start