Integrity and authentication are important to security. Digital signatures and HMACs serve as two of the primary means of providing that security. In this video, I cover the mechanics of each. I also explain how TLS 1.3 leverages digital signatures and HMACs. If you haven't already, you may want to watch my videos on certificates and hashes to help in understanding some of the topics in this video. Here are some of those videos: Intro to Hashing: https://www.youtube.com/watch?v=M6ZZa-9h80Q What is a PKI: https://www.youtube.com/watch?v=5OqgYSXWYQM Certificate Issuance: https://www.youtube.com/watch?v=L1GkEnftoRQ Certificate Validation: https://www.youtube.com/watch?v=lLw0dICMA_Y