Digital Certificates: Chain of Trust
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- เผยแพร่เมื่อ 30 เม.ย. 2017
- This video explains how an Certificate (such as an SSL type) is validated by a client. Concepts discussed are digital signatures, Root CA and Intermediate CA.
This is the 3rd video in a series on encryption and certificates: Other videos are:
Introduction to encryption
Introduction to Digital Certificates
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At 14:27, you will see that the CNNIC cert is indeed listed in the keychain of the macOS (an oversight by me). However, built into browsers is a "black list" where the browser itself can invalidate a root certificate. So when Google found the breach, it added code to the next update of its browser that will effectively revoke CNNIC's root cert even though one appears in the operating system's certificate storage area. When users launched Chrome, it will search for an update.. when one exists it installs the new code and .. there.. that certificate is revoked and so Chrome will no longer validate CNNIC's certs. I believe that browsers have both white and black lists of root certs built into their code so they can add root certs, if they don't think one exists in the OS, or invalidate root certs. But all OSes have a central storage area for CA root certs so browsers don't need to store a complete list.
Can we see the blacklist that a browser, has for root certs? Or do you think that is intentionally hidden from end users?
@@DataVids I am not that familiar with the internal workings of all browsers. Chrome contains a CRLset that is a list of banned sites. It can’t be viewed directly but can be dumped with public code. (dev.chromium.org/Home/chromium-security/crlsets).
@@davecrabbe4579 thank you!
Ha, I was about to comment that!. BTW in my key chain it is not. So at some point Apple also removed it.
This has to be the clearest, melodrama-free explanation of digital certificates on TH-cam. Thank you for taking the time to explain this.
I finished my IT studies 2 years ago and never got clear in certificates understanding. Now I wanted to acquire this competence once for all. Watched many videos, still didn't get the thing. Then I found yours. This is masterpiece explanations, everything is now crystal clear into my mind. Most of the videos skip steps so it's not understandable. Thank you so much for this high quality lesson.
This is by far the best explanation on Certificates.
Indeed!
clear explanation without using any fluff or word salad, straight to the point! thank you!!!!
Amazing explanation. What I couldn't understand for over 2 months was water clear in less than 30 minutes. Thanks.
Searched the Google, searched TH-cam didn't find a good explanation of certificate for beginners, THIS VIDEO IS GEM IT HAS ALL THAT A BEGINNER NEED TO UNDERSTAND. THANK YOU FOR THE VIDEO!!!
Thank you Dave, excellent explanation!! Clear and direct. Agreed that this is the best chain certificate explanation I´ve ever seen to date.
Thanks Dave! These two episodes on TLS certificates was the best I have seen. Thank you, Thank You.
Straight forward and comprehensive explanation. This is the only resource on the topic that made sense to me and filled in all the gaps.
Awesome tutorial. I am struggling to understan the chan of trust since ages and today this tutorial has cleared all my doubts. It made my day. Million of thanks to Dave. Long live and god bless you.
this is the best and most simplified explainnation of topic... loveed thatt...thanks much for your efforts
Excellent explanation! Searched everywhere to lean more about how the chain of trust worked in detail - finally found it here! Thank you!
Thanks.. older video, but its all built on the same basic concept, so far.
Simple and to the point without age old theoretical rhetoric.
I had so many doubts / confusion about digital signature and how it works, now i understood completely, thanks for the nice explanation
thanks for taking the time to post these videos. i'm a network engineer and your teaching and explanations are excellent! appreciate it!
Glad you enjoyed it.. thanks
This is the best explanation across all articles and videos.
Wow, you made understand those SSL certs once and for all, and it's much appreciated. Also, you have a great hand writing. Keep up the great content sharing in your channel, I'm definitely subscribing.
This is really awesome explanation. Probably the best that i have ever seen till now.
Excellent instructional "Chain of Trust" SSL process. Thank you for your valuable time. :)
I'd like to echo what others have already said and thank you so much for such a clear explanation of this process. I have been able to explain PKI principles to colleagues from the knowledge learnt in this video. I've been an IT professional for the past 9 years and PKI principles have never really stuck but this one made the penny drop. Excellent work.
the best explanation on youtube I've found so far
thank you so much for your work!
This is the perfect video i found in youtube which explains the concept of cerficate chain.. take a bow Dave
A fantastic and clear explanation of the Chain of trust..Kudos!
Finally an explanation that connects all the dots! Great explanation.
Finally! found some quality material... and it was free. thanks
It's was an deep and easy to follow dive into the e-certificates world. Many thanks!
This is great and simple, finally someone covers how the certificate is verified to actually be from the specific CA.
Sir, the video is simply perfect. I work in IT, I dont play a lot with certs or CA but this was to the point where i had enough to do my job. Thanks :)
A great presentation about chain of trust and certificates! Really great. Thanks for that
This is the best video on SSL I have come across!
Best explanation about chain of trust I've ever faced.
Thank you! This is the best explanatory video for ssl certificates
Seriously love the way, the information provided, clear concept
This is the best explanation so far on the internet
Thanks Dave for clear cut explanation. Have a good time.
I also had trouble spelling Hierarchical! (Thank goodness for auto correct😁)
Fantastic explanation btw - I've been scouring the web for a decent explanation and after your video I feel my knowledge gap has been quenched. Liked the video so that after I've had a sleep and forgotten it I can simply refer back to the masterclass. Thanks again
By far the best video on this subject. Thank you.
This was a nice and comprehensive step-by-step overview! I've browsed through a bunch of information regarding certificates, validation etc, and this video turned out to be a gold nugget in a topic where other information sources choose to gloss over the details and specifics (perhaps due to a lack of understanding?).
Some go into too much detail and you never grasp the overall concepts.
One of the best videos to understand chain of trust
Finally a satisfying explanation of certificates, thanks
The best explanation ever I've faced about "Chain of Trust".
By the way, you have the root certificate of CNNIC on your browser. :)
yeah.. I picked that up after it was posted.. I'm still learning too :)
Thank you Dave for the excellent presentation and i like the case study you put at the end.
best explanation!! well done
This is the most amazing video I have ever passed by , because you are the only one I saw that explains the SSL and Chain of Trust in details with a great example.
Thank you very much dear and I am very happy that I have passed by while I was searching on tutorials to understand how this process works.
Best Wishes and Blesses.
Thanks..
great explanation, Thanks Dave for putting this together. really helpful.
perfect video ,really good explanation to how the chain of trust occurs
This is awesome! You explained it soooo well.
Great Video, really informative! Exactly the information I knew I didn't know.. Thanks!
Absolutely brilliant explanation, thanks!
excellent presentation. one of the best. thanks.
Many thanks for this clear, concise and well presented explanation,
Best regards.
awesome explanation ! cleared my doubt... this clearly explains why do we have chain of trust in the first place...
GREAT Explanation, thanks Dave!
This is by far the best explanation, if you have basic understanding, I learned first 3 chapters from book called PKI uncovered from cisco press and then watched this video, which resolved all the grey areas, thanks man
super! Thanks for the comment.
One of the best and crystal clear explanation I have ever seen !!
One piece of information missing in this video that will be helpful: Data encrypted with the public key can only be decrypted with the private key, and data encrypted with the private key can only be decrypted with the public key. So notice that the hash of the SSL certificate is encrypted with the private key and can only be decrypted with the public key.
Great and simple.......good job sir
I've been watching SSL related videos for the past hour and this explanation at 11:52 was what I needed to fill the gap!
This is not how it works nowadays. If you want information about that part, look for diffie hellmann key exchange.
Yeah the latest version of SSL was deprecated in 2015
The problem is if the private key ever gets compromised at some point in the entire future of humanity, all past communication becomes compromised. Not good. Private key should only be used for identification and after a breach simply be replaced without further damage.
Thank you ! you made it very simple and to the point.
Thank you for this very thorough explanation
Fantastic explanation !!!
Done thanks took notes in onenote
Best video on the topic!
Very well explained. This answered a question I was having :)
I had to change the speed to 1.25 and the video became so much better! Thank you for the nice explanation.
grin.. I'm older and I go slow these days..
Awesome explanation Sir......
thank you so much....
Thanks for delving into the details of this process. Other videos don't seem to discuss the details in much depth.
Thanks for the excellent explanation!
AWESOME explanation!
Very well explained. Thank You !
Thanks for putting and the time and effort in generating the video, it was very informative and helpful watch =)
Great Explanation.. Thank you. God bless you.
Awesome video. Thank you very much
Great explanation, thanks!
Great video, this helped me a lot!
Just one word "Excellent" !!
Thank you, very good explained!
very nice explanation! Thanks
Thank you very much! Very insightful.
Excellent! Thank you!
Perfect, thank you very much Dave
Excellent explanation..thankyou
Thanks this was easy to follow and understand.
I agree with earlier comments. This is the best video on SSL I could find on TH-cam. I shared it with my coworkers. Thank you.
Thanks for the comments. The actually technical implementation has so many more details. I tried to distill it into the core concepts.
Very well explained, Thank you
good one. nice explanation
Thanks for the video. It is really helpful
Just wanted to commend you on the quality of your videos in explaining a complicated subject - I was able to clarify multiple concepts after muddling through several documents.
Glad you enjoyed.. With all the complete details, it is a very complex topic. My attempt was to break it down into only the necessary components so that people understand how the basic principle works.
Comprehensive explanation
great video, very clear.
At 14:25, you can see CNNIC ROOT listed in browser certificate list.
extremely helpful, thanks
Amazing video
very well explained!!
Great tutorial
Best video of SSL
thanks for sharing this video!!
Thank you very much for this video
Your are saving my time thanks
wow clear explanation.
Great video. I can see multiple comments of 1) encrypting vs. validation and 2)encrypting with either private or public key and undoing the process with the other key. Second comment that was useful was the reason to using an intermediate certificate authority (a security feature, limit damage if private key ever gets leaked). Thank you! Would it be possible to make a video about wild domain (multiple domain) certificates?
My homework now is to encrypt with a private key and decrypt with the public and to compare against other validation/signature verification flows. In JWT, (head.payload.signature) I would thought that you had the payload, you would encrypt it using the public key (generate the signature) and then compare it against the signature for validation.