SSL and minimum encryption technology that you can learn by memorizing

I have completed the course. Regarding SSL, I only knew about determining whether a certificate is trustworthy by Googling the public key of the CA installed on the PC, but I have a chance to properly learn about the organizations related to certificates, such as symmetric key ~ asymmetric key ~ hybrid method ~ PKI authentication system flow. Thank you. --------------------------------------- For your information, the tuition fee of 44,000 won for this course is not expensive for students compared to the class time. For those who are taking the course, I recommend subscribing to the instructor's YouTube channel and visiting the community, where the instructor gives out coupons for his lectures every month, and using the coupons to receive a discount and take the course.

I am a student. I was assigned to the authentication and authorization part of the web service team project, so I wrote the code using the jwt token method. Since I followed someone else's code without understanding it, I searched for various videos to understand it, but I wasted time. This lecture is the answer. It is not important to have a jwt token or a jwt data structure, but the concept of cryptography. (Even if you don't know terms like jwt token or something, if you have a concept of cryptography, you will be able to understand it when you write the code.) The lecture title is "Memorize and finish", but the core concepts are explained very logically. "Memorize and finish" means "I will not prove it mathematically, but I will just organize the results and tell you." Anyway, I gained a lot of knowledge, and it was very fun. Maybe because the lecture title is cryptography, not many people seem to take it, but it is almost essential for developers to know.

Thank you for the great lecture. I thought it was a difficult topic, but the analogy was so good that I could understand it easily.

Thank you so much for the great lecture!! I was implementing the login part while making an app, and I didn't understand what they were talking about, such as hash and public key, but you explained the entire flow, so I understood it so well!!

This lecture is also very helpful for basic knowledge in understanding OAuth2. If I had watched this lecture and tried to understand JWT's RS256 algorithm and JWK, I think it would have taken a lot of time. Thank you for the great lecture.

I was able to easily understand the basic concepts of symmetric/asymmetric keys and hashing, blockchain.

Thank you always, teacher!

It was content I never understood no matter how many times I looked at it, but overall it was easy to understand.