Public and Private Keys - Signatures & Key Exchanges - Cryptography - Practical TLS

[@PracticalNetworking]

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[@felixgallardo1783]

This session was great, thank you!

[@rogermcnulty887]

I’m 38 years old and a newer IT professional after switching careers. I just recently earned my BS degree in IT and got hired at a major defense company. I’m watching these types of videos for better understanding of specific types of concepts covered in Security+. Also I’ve been personally using technology since the days of original Oregon Trail as a hobby. As my first ever KZbin comment: These videos are fantastic videos. You deserve way more subscribers than you have. Fantastic explanations man. Bravo.

[@PracticalNetworking]

Hi Roger! Thank you so much for the kind note, I'm honored to be the recipient of your first KZbin comment. =). Hope things are going well at the defense company =). Let me know if your team would benefit from in person training, I'd be happy to oblige. =)

[@mertcancam]

I can't thank you enough! Finally, I am beginning to truly understand all those topics that I have been struggling to grasp.

[@PracticalNetworking]

Excellent, Mustafa. Glad it's all "clicking" =)

[@aditisinghpal1116]

I am a Law Student and was finding it difficult to understand the certain concepts of Information Technoloagy law involving core aspects of cybersecurity. This video simplified everything and explained articulately. Thank you to the author!

[@shayanpz7209]

I watched different videos on KZbin to understand this concept and no one else explained this as good as you did! Great job 👏🏼

[@PracticalNetworking]

Thank you, Shayan. Glad this helped =)

[@santoshkumar-dr4qg]

Again, I am amazed about the nitty gritty details this video is providing. The author starts with basic concept and take it to another level once the basic is done. This increases our horizon in which the techniques can be used. Well done.

[@PracticalNetworking]

Thank you, Santosh =) Glad you liked this video!

[@karamjeetpadam4719]

this is the most practical explanation of cyryptography in the entire KZbin.... thanks for such a simplified explanation!!

[@CedevismoLiberale]

Man, you deserve a medal. I've read and watched countless sources and never understood how this worked, until listening to your words, where you specify that encrypted stuff with public|private key can "only be" decrypted by the other one (private|public) depending on the case. The most unclear part of this concept is that one of the keys can describe what the other encrypts. It is absurd I realize only now, after years of wondering. I may be wrong, but I think what makes all of this counterintuitive (not just in yours, but in literally every source I've got info about this matter) is the analogy with physical keys, that usually don't have this specific kind of property. What should have made it more intuitive, resulted in way more confusion for me. Thank you so much, this video was "the key" that unlocked in me the path to understanding.

[@southern_smacker]

I first tried to study Public and Private keys encryption back in 2002 after passing my Java 2 certification, but could not understand the concept. I then kept struggling with understanding how encryption and SSL/TLS works. Today this mystery is solved forever. I would like to thank the creator of this wonderful course.

[@bentabarzadi3379]

I have never comment for any video EVER! but you are amazing! Simple, short and sweet! THANK YOU SO MUCH! WOW!

[@tomnguyen1015]

FINALLY sometime who actually understand and know how to explain things PROPERLY

[@terjidjurhuus1917]

In a few minutes you managed to simply explain what hours of other videos managed to complicate. Thanks!

[@yiweima4412]

This is easily the most beautiful explanation video on KZbin to date.

[@privatesocialhandle]

My god, I can't believe I had to search so long for a video that makes sense for beginners. Subscribed.

[@encryptionforbeginners96]

Thanks for the great video. I found the factors P and Q for the number 1909: P=23, Q=83. To do this, I used the "Quadratisches Sieb" factorization procedure, which operates as follows: First I calculate the square root of 1909 which gives the value "43.69". After that I set the factors P = 43 and Q = 44. Now the calculations follow. If I calculate P*Q (43*44), then this results in "1892". Since this value is smaller than "1909" I increase Q by one -> Q=45. Now I calculate again the product P*Q (43*45) -> "1935". The value is now greater than "1909", so I decrease P by the value 1 -> P=42. I follow these rules until the value 1909 is calculated. Summary: - P*Q (43*44) -> 1892 < 1909 -> Q+1 (45) - P*Q (43*45) -> 1935 > 1909 -> P-1 (42) - P*Q (42*45) -> 1890 < 1909 -> Q+1 (46) - P*Q (42*46) -> 1932 > 1909 -> P-1 (41) ..... - P*Q (23*83) -> 1909 = 1909 I hope this is helpful.

[@PracticalNetworking]

Great write up! This proves 2 things: 1. Any key can be solved via brute force 2. Brute force doesn't necessarily require trying _every_ possibility, there are shortcuts you can take as you did =) Going to pin your post, to bring more attention to your write up and hopefully your channel. Good stuff!

[@encryptionforbeginners96]

@@PracticalNetworking Thank you for pinning. The great thing about the algorithm is also that this can be divided into several threads very well. So you could crack your RSA-1024 key on a graphics card quickly :-)!

[@PracticalNetworking]

@@encryptionforbeginners96 The difficulty scales exponentially as the key size increases. To date the 1024 bit "RSA Number" factorization challenge has yet to be solved. en.wikipedia.org/wiki/RSA_Factoring_Challenge en.wikipedia.org/wiki/RSA_numbers#RSA-1024

[@scottspa74]

Ummm you're sort of a genius

[@ChaoticBeing-yj3ij]

I was legit mind blown after seeing this video wonderful explanation

[@RaidenHeaven]

You know why this video is the Best? Because it doesn't hide the fact you can Encrypt with public and Decrypt with private but ALSO Encrypt with private and Decrypt with public May are too scared to say that.

[@PracticalNetworking]

If you enjoyed this video, you'll love my video on RSA where I prove exactly that with the math =)

[@DG-fs1pq]

I say this about each of your videos, but seriously....You are the best teacher when it comes to this material!!! I finally understand this clearly.

[@PracticalNetworking]

Thank you, David. Glad you are enjoying this content =). If you are willing... could you do me a favor? Do you mind sharing these videos on Linked In, Reddit, Twitter, Facebook, or any other social media you use? As an independent creator, that would be an _enormous_ help, and I would appreciate it _greatly_ .

[@DG-fs1pq]

@@PracticalNetworking I share it quite often. Thanks.

[@PracticalNetworking]

@@DG-fs1pq In that case, *Thank you **_very_** much for your support.* Much appreciated

[@dg223-p1r]

I am taking an algorithms course where I implemented all the math for calculating RSA keys, but still could not understand how to use them. Now I get it! Thanks, this video was great!

[@lawrenceonlineshop7040]

Good Teacher! Very rare to see someone taking difficult concepts and making it simple for others to understand better.

[@alan29115]

So many explanations go right over the actual essence of how these keys interact to encrypt and decrypt. Almost as if they don't even know it themselves, just regurgitating shit from a textbook. THANK YOU

[@PracticalNetworking]

You're welcome, Alan =). I too agree I've heard many people attempt to explain this by simply regurgitating what others have said... agreed 100% =).

[@yosephteshomebirhanu6639]

i dont think GPT can explain it this way this days... Cryptography is the major topic in ISS, it paves the way to understand, Authentication, Acess control and internet network security... with this regard all your explanations starting from the concept Key are paramount ! i cant thank you enough!

[@north4220]

honestly i wish you happiness , i was struggling to get a grasp on this subject , you explained it in a wonderful way thank you !

[@LuvxJacqu4li8e]

Amazingly done again: using Pam's public key to encrypt so she alone can open it with her private key. Wow!!!

[@cevuwolf3077]

I agree with Mustafa Mertcan CAM ,finally someone explained the proper way.Thanks a lot :D

[@PracticalNetworking]

;) Thanks for the kind words.

[@med0897]

I was a bit confused on how encryption in TOR hidden services works, especially the part of signing the hidden service descriptor and the onion address derived from the hidden service public key, now because of this video it makes perfect sense, thank you very much for this amazing video, great work !

[@rockystark9539]

Incredible performance, man needs a solid understanding of encryption to explain it in such a way. Well done.

[@PracticalNetworking]

Glad you enjoyed it =).

[@fab5749]

This is by far the best explanation on this topic

[@PracticalNetworking]

Agreed =)

[@pinoyheartbeat7245]

I am currently enrolled in Cisco's cybersecurity course and I always look at this particular video whenever I get symmetric and asymmetric and public and private keys confused with one another. Very very good tutorial.

[@vmkkannan]

the content you explain is in order and clear to the subject... easily understandable...

[@IliyaDamyanov]

This is the best video in the internet explaining this topic.

[@lallu1122]

Super work - probably the best SSL videos on KZbin.

[@kaykay02120]

no words to explain. excellent series

[@grigorynedaev7254]

Thanks!

[@PracticalNetworking]

You're welcome! Thank you for supporting the channel =)

[@vihanga01]

im currently working on Project Spring Security ... this content helps me so much can’t thank you enough

[@neetadhavade]

Superb! very well explained

[@rob651]

I have taken many tutorials online, watched many educational videos but your tutorial is so different. You are a great teacher sir. I dont understand how but the topic is explained in depth and at the same time in a very brief and concise way. Thank you very much! Keep up the good work!

[@AHMondal]

The best video I found on KZbin on this topic! ❤🎉

[@mmdbx]

The way you explain things uses the right level of simplification, to facilitate understanding, but doesn't get lost in the details. Thanks for your great work, much appreciated! (I always had challanges to understand the difference between the concept of signatures vs. bulk encryption, but this visualization of yours, with the explanation helped a lot!)

[@PracticalNetworking]

Glad this helped make it click. Thanks for the kind words, Gergely =)

[@gangstaberry2496]

Thanks for the video... This explanation is a lot clearer than the one I saw in class

[@alistairbarros8192]

The best explanation and video I've seen on secure communications using asymmetric and symmetric keys, the illustrations and pacing of explanations are exemplary!

[@arashmahari9570]

Thanks, a lot. A great video.

[@adityae83]

You explain really well, after going through few videos and still not grasping the concept your video and explanation helped me understand this concept well. Thank you for this video.

[@noel1637]

The best explanation i have found about pgp. Thank you

[@Scottpie47]

Omg FINALLY an explanation of public/private keys that made perfect sense to me!! Thank you!!

[@PracticalNetworking]

Glad this one helped, Scott =). You're very welcome.

[@bitfluent]

Concise, simple, and visual. Great video!

[@peterchmelar8886]

Another gem :) Thank you for the uploads Ed. Every video is packed with useful knowledge.

[@PracticalNetworking]

Thank you, Peter. Glad you're enjoying all of these =)

[@scottspa74]

Ed, you are absolutely the BEST!. I'm finishing a 2 year degree at Edmonds and feel like I've learned little (all during covid, virtual) and frequently refer back to your amazing instruction. You def have the calling of a professor (not to mention your obvious chops as an engineer).

[@PracticalNetworking]

[@zs8850]

Absolutely brilliant content! Thank you for taking the time to create this!

[@PracticalNetworking]

You're very welcome. Glad you enjoyed it.

[@martinmokran6324]

Another great video in Practical TLS series! Thank you.

[@PracticalNetworking]

Thank you, Martin. Glad you enjoyed it!

[@AtharvBogra]

This video is awesome in explaining this concept and how hashing and encryption come together in PKI as this was what Ive been struggling to grasp in terms of the complete image! Awesome job.

[@prasadpulaguntla9255]

The best video to understand how JWT works (although jwt is not explicitly discussed in the video). Can't thank you enough for such a clear and simple explanation!!

[@prasadpulaguntla9255]

I meant how JWT signatures work

[@PracticalNetworking]

Thank you for the kind words, and thank you for supporting the channel =).

[@rajeshrama86]

The best explanation I came across after a lot of reading.................Thanks a lot sir

[@AnantaAkash.Podder]

This is the BESTTT lecture to Public & Private key & how TLS works... Thanks a Lot Man 😊❤️😊

[@sammyfrost9244]

Love the way you explain. Everything is crisp and clear

[@szilardfineascovasa6144]

Boy, this video indeed demonstrated the mission of the channel as stated: hitting that sweet spot between basic and too complex. I often find myself frustrated right in that "Twilight Zone", googling and switching between articles and videos (only to become more frustrated). As someone else was saying, this made JWT make sense as well...after reading through stuff that was starting nicely, bulding up nicely, only to then muddy the waters in an epico style 😁. Was tempted for the first time to read the RFC. Bookmarked, subscribed, and will certainly chek the other videos. Thanks!

[@PracticalNetworking]

Thank you for the kind words! Glad you enjoyed this series. Thank you for supporting the channel =)

[@atulsurjuse2916]

This is one of the best explanation of the difficult subject.I was struggling to understand the base of this topic..Now it's cleared.Thank you very much..!!

[@danialranjbar9805]

Thank you for your time and effort for sharing us all this knowledge for free.

[@chittlingwhittles1198]

Thanks for all of this. Superb content and presentation! Does anyone else feel guilty when you forget to like a video as you’re gobbling this stuff up?

[@sgwong513]

agree, this is the best video series explain how the ssl/tls and encryption works.

[@MultiBob1010]

Thank you so much, you made my day, I've been reading bunch of articles about it, there was unclear idea to me (which I can use the private key to encrypt the data and use the public one for decypt) by your video you made the pic clear to me

[@PracticalNetworking]

Wohoo! Glad I could help. Glad it makes sense now =)

[@rkveluvali]

I can't thank you enough for the detailed explanations, providing necessary intricate details in a lucid and understandable way.... 🙇

[@helena8918]

Best video yet, BY FAR. All well explained, and following all the principals that we should have in count when learning encryption and informatic security.

[@raghav3914]

After watching a lot of animated videos on the same topic, this is so far the easiest explanation.

[@roytitas]

Thank you for explaining each topic with such clarity! This is very very helpful.

[@momo8718]

I am currently reading a book on cryptography and hash functions and this is a really good illustration. Well done!

[@PracticalNetworking]

Thank you, momo. =)

[@OscarPerez-ox8sq]

So far best explaination seen on internet.

[@CKZA10]

Really well done video. There's not so many well-made videos that take on the concept, because you can't just dip your toe in the water and experience the totality and awesomeness of encryption and how it sets the stage for what we do and use daily. I can also highly recommend Paul Turner's KZbin videos on SSH and PKI. And then Ivan Ristić's excellent book on SSL and TLS (Bulletproof SSL and TLS - Feisty Duck publishing) - the book started off as a very good TLS 1.3 book but has transpired into something much more and is currently in its second edition (preview stage). If you truly want to get to grip with SSH and PKI - play with it on your PC. It's free and with a bit of virtualization you can toy with SSH Authentication against servers. Heck, PGP is also straight forward with GPG cli and on Windows you get Kleopatra for the GUI experience (although with GPG command line you can do a lot more like sub keys).

[@PracticalNetworking]

Ivan's book is solid. I haven't heard of Paul, just looked up a few of his videos and yes, I agree, it also looks pretty solid. Glad to be compared to such high quality sources. Thanks, CKZA10 =)

[@renansantos8727]

Thanks, saved my life with such clear explanation

[@rpinto8800]

Thanks again for making this available to us, just finished the playlist enjoyed it, well explained.

[@PracticalNetworking]

Glad you've enjoyed it! Next video releases Monday =)

[@fuadyhidayat]

What a great explanation. Finally it all make sense. Thank you for providing this video. Really really helpful.

[@PracticalNetworking]

Cheers Fuady =) Glad it helped! Thanks for the kind words.

[@Frack_Black]

This channel has become my go to for catching up on stuff I haven't, previously, fully understood. The simple breakdown of the subject matter makes for easier digestion. 👏👏

[@PracticalNetworking]

Welcome, Frack =). Glad you're enjoying this content and how I present it!

[@PracticalNetworking]

Congratulations, you won the giveaway. Message me on discord to claim your prize -- pracnet.net/discord

[@Frack_Black]

@@PracticalNetworking lovely, thank you. Will pm later.

[@Frack_Black]

Thanks for the course. 😀

[@SadiyaBukhari-d7k]

Thankyou may Allah reward you , after racking my brain telling chatglt to explain this to me and going crazy , i finally understood it alhamdulillah, couldn't have done it any better 😭👍

[@hosseinshourabi398]

Woooooooonderful. I am amazed about deep details this video is providing. Well Done, Thank you so much!

[@PracticalNetworking]

Glad you enjoyed it, Hosein =) You're very welcome.

[@chukwukauba2417]

You have really simplified this mystery for me. Thank you!

[@fishfanaticgokul4758]

Most valuable video i have seen in this year 🎉🎉🎉🎉 am really astonished ❤

[@shankar7435]

After watching other some 100 channels vodes, I was hopeless to understand about actual tsl. Now I could easily get it at single shot about it. I knew it's always who teaches make difference but not the other way.b

[@PracticalNetworking]

Excellent, glad it makes sense now =)

[@hasanalmuazzaz4678]

thanks, no one else explained this as good as you did.

[@mitxdreams]

Muy bien explicado. Lo entendí hasta en ingles😂

[@rafay1708]

You always know how to make life brighter for everyone you know. Thank you so much for spending your Golden time to make such useful Video. these Keys are not easy to understand and to explain but you make it so much easy to understand. Thanks, waiting for your next Video. ✌

[@PracticalNetworking]

Thank you for the kind words, Rafay. Glad you're enjoying this content =)

[@digitaldrive1192]

Very nice. Concise, clear with simple and effective animated diagrams. Not sure if it gets any better than this.

[@PracticalNetworking]

Glad you liked it! =)

[@JimOlson-r4h]

I want to project this video into the sky like the batman, just to give you the proper credit. BRAVO

[@sandhyachowdhary2511]

Amazingly tutorial 👍the best all my doubts are cleared

[@PracticalNetworking]

Glad to hear, Sandhya. Cheers !

[@paolonervi2208]

Your videos are really super useful and interesting.thank you for the time you dedicate in making these contents.greetings from Italy.Paul.

[@PracticalNetworking]

Hi Paolo! Glad you enjoyed them! Thank you for the kind words. Cheers!

[@alexl2512]

Thank you so much for your explanation. It is very clear and accurate. 🎉🎉🎉

[@tusharludhrani8059]

this was the most amazing explaination ive ever heard!!!! thankyou sooooooo muchhhh

[@yijingmeng]

Thanks for the great video. Really clear and good explaination.... I just need to come back and watch it several more times to make sure I grasp all the details!!!! Mind explosion now, haha!

[@shujauttali2608]

seeing your videos everyone will switch his/her career to networking 😍

[@tony_0088]

This video is awesome, congratulations guys! You explain complex topics in a very simple, elegant and didactic way.

[@PracticalNetworking]

Glad you enjoyed it, Tony =). I'm sure you'll enjoy the rest of the Crypto series: kzbin.info/aero/PLIFyRwBY_4bTwRX__Zn4-letrtpSj1mzY

[@jeffchen86]

Thanks bro！I struggled a lot to find out this stuff,but you help me a lot just in a few minutes!You are so amazing!

[@PracticalNetworking]

Excellent Jeff! Glad it makes sense now. Cheers!

[@nidhisharma3578]

Thank you for making it so easy to understand 🙏

[@PracticalNetworking]

You’re welcome 😊

[@gtbsaraiva]

Incredible didactics method. Congratulations

[@bill0cao]

Thanks for this great lesson which very clearly explains the topic!

[@masoodaziz4338]

Great job and really well explained with simple manner

[@NBAUsaisyourfather]

Appreciated and thanks to you for sharing the typical things into easy way....

[@PracticalNetworking]

You're welcome, Golu.

[@ersoyyildirim5838]

Such a perfect and clear explanation

[@PracticalNetworking]

Glad you enjoyed it!

[@RaulVillanueva82]

Wow, the best explanation ever.

[@PracticalNetworking]

Thank you for saying so, Raul.

[@learnbit_bo]

genius! you explain this concept very succinctly

[@PracticalNetworking]

Thank you =). Glad you liked it.

[@po6577]

Best explaination I had seen out there! Thanks!

[@trino4965]

Thanks for making understand easy what I couldn't understand for years