What is digital signature?

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A digital signature is equivalent to a handwritten signature in paper, and a digital signature serves three basic purposes. Digital signature is commonly used for software distribution, financial transactions and other cases where it is important to detect forgery. Digital signatures are very popular with e-mail users.
In this video, I will talk about the digital, uses, and the whole process of creating and sending digitally signed document over the Internet.
Keep in mind, digital signature is not about encrypting document, just like paper-based signature.
Playlist: Basic Cryptography
• Private Key Encryption...
Advanced Cryptography:
• What is digital signat...
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Many thanks,
Sunny Classroom

[@amosgakwerere266]

the entire semester i did not understand this but only 5 min i got it, thank you Sunny

[@Ada-hd3zp]

Sunny, I just wanted you to know that today I provisionally passed SSCP and I would have not achieved it without your youtube lessons. You are the best teacher any student could hope for!

[@sunnyclassroom24]

congratulations! I am so glad to hear it.

[@thkhan]

share your experience while achieving SSCP

[@faiqarif5765]

Woah my book fails to explain this in 5 pages, what you did in just a few minutes.

[@leonardolelisrocha]

The same here, his explanation make the subject very ease.

[@its_bijay_adhikari]

exactly!!

[@NutzndBoltzTutorials-zs2fy]

Exactly

[@matrixlnmi169]

@Matias Gatlin Since she is your girlfriends & you know in & out about her , then what made it necessary to hack her account

[@khalidabdi9537]

bro can u send me yr book and help me do my thesis if u don't mind?

[@mulimotola44]

Great explanation! Thank you! I only want to add that the reason we use a hashing algorithm before encrypting a digest, is to make the digital signature small. Because if the plain text message was 10GB in size, then using a hashing algorithm on it creates a small string of only a few bytes. But we if created the digital signature from the entire 10GB text message, then we would have to send 20GB worth of data - 10GB for the original message, and another 10GB for the digital signature used to verify that it was signed by Bob. In case anyone else was wondering why we use a hash algorithm to create a digest, before encrypting it with the private key to create a small digital signature. Remember, if any small change was made to the original message, the digest would be completely different, and that's why we can use this method to decrease the size of the digital signature.

[@kristiyanivanov7414]

Good to know!

[@bac7002]

I was so confused and I was exactly looking for an answer of that question in the comments section. Thank you, you are a legend.

[@naibeginning5775]

kzbin.info/www/bejne/Zneai2qCjdiFZsk Do you have Digital Signature ????

[@susanmyonghee]

Sunny, you are a treasure! I'm so grateful I stumbled upon your channel. Your explanations and visuals break the topics down so that it's so understandable. Thank you, thank you, thank you!! 🙏🏻

[@natolgaa]

I can’t believe I didn’t stumble upon your videos earlier while studying for the CISA. Domain 5 has had some difficult concepts to understand and taking even 30 min to watch a few of your videos has finally made concepts click. Thank you so much, you’re a wonderful teacher!

[@manishashenoy7474]

You explain this better than anyone, Sunny. We are so blessed that you are on KZbin. There are ones that talk for 1 hour and don't explain it as well as you have in 5 minutes. Thanks for explaining it so well!!!!

[@sunnyclassroom24]

Wow, thank you!

[@psoidonym2389]

Sunny, your explanations are spot on. In your Public key video, you made clear, that the process starts with the receiver. Here you pointed out, that digital signature and encrypting the message are two distinct things. I watched a ton of videos to understand those concepts. No one made these differentiations. Hence, they are critical for the understanding. Thank you very much for your work.

[@ssambadenis9401]

I must thank you sunny for wrapping up the whole topic meant for 1 and half hours in just 5 minutes. It was really educational and useful.

[@michaelbenford492]

Thanks for explaining this and other topics so clearly! I have watched lots of other videos by professors, experts and students but they all miss the point. You explain this and other topics so logically and clearly that it's a pleasure to watch. Thank you so much!

[@Wolcik3000]

you explain it very well - the logic is sound and easy to follow unlike some people that gets trapped in the technical details before explaining the basic steps

[@bpaulkim]

I love this guy's videos. Simple and clear.

[@roytitas]

You make any topic so simple yet clear. Thank you very much Sunny, I have always referred to your videos when in doubt.

[@prkhr.kmr.27]

Your videos make such complex stuff so damn easy to understand! Your explanations answer questions which even whole of the web can't.

[@sunnyclassroom24]

Thank you very much for your encouraging words. I will try my best to live up to your kind words.

[@paulg6340]

The best description of this topic I have found, very helpful, thanks very much!

[@beenarautela]

I am glad to found out your channel. You really explain the complex topics in a simple, clear and concise manner. Your videos helped me understand the Assymetric encryption topic well. Thank you so much :)

[@sunnyclassroom24]

You are welcome! I am glad it helped.

[@manudeepp5666]

Good stuff man! You made this concept crystal clear

[@axionW]

Thank you Sunny! I was preparing myself on your channel for the cryptography exam for my dream job. I got the job and I explained digital signature, hash functions and PKI exactly the way you do on your channel. Thanks to you I had the best written exam among all the participants. Keep doing the great job!

[@sunnyclassroom24]

I am happy for you and congrats on your new job. I will do my best. Come back to channel sometimes and suggest new topics for me. Congrats again.

[@axionW]

@@sunnyclassroom24 I certainly will. As you asked me for a suggestion, I would love to see you explain how some of the cryptographic primitives reside in the crypto asset world. i.e. how did Bitcoin protocol made use of digital signature, or explanation of some more advanced techniques like ZKP and how the zkSNARKs are made and their components or cryptography behind Mimblewimble protocol. Have a nice day sunny and please don't forget to enjoy yourself!

[@omidsupply9550]

It was a very elaborative with example which i struggled a lot studying books and youtube it to clear my confusion. I appreciate the way you explain straightforward and simple.

[@Dinesh_Wadhwani]

Bob, I agree with the other positive comments. This is the absolute best explanation of digital signatures with email or memo that I have seen. Great job and thank you for this. 👍🙌

[@dannuttle9005]

It's embarrassing how little I understood about this, and remarkable how clear this video makes the subject. Well done.

[@kattopeter7280]

You are amongst the best teachers who had in my whole life; you are the best best. GOD Bless you, Sir.👏👏👏👏

[@navaneeth5341]

It took me several years to understand this simple process. Thanks, Sunny.

[@brandsbrooks]

Thank you Sunny! This cleared up some confusion I had about this topic, so glad to have found this explanation.

[@stefr5941]

Sunny, you are my favorite. You are making it easier for me to understand things.

[@abuabdulrahman1871]

I am reading from the book, it took me hour to barely understand, five minutes video goes directly to the point, thanks Sunny!

[@sunnyclassroom24]

Great to hear!

[@prar_shah]

After watching tons of videos... finally I was able to understand the concept after watching your video..thanks alot sir

[@sunnyclassroom24]

You are welcome! I am glad that it helped.

[@davidr.flores2043]

Dear Mr. Sunny. You are amazing at explaining things. FANTASTIC job, a million thanks!!!

[@sunnyclassroom24]

You are very welcome

[@yagzyalcntas553]

you never ever disappoint. always the best explenation. You pointing out the common confusion also helped a lot.

[@tkhue3296]

This is what our newbie need, Im studying Network+ and those materials im using just lead me to a very frustrated situation , but your explination really straight forward and newbie friendly . Thanks you Sunny, pls keep your channel updating and introducing more , i have subscrbed .

[@sunnyclassroom24]

Thank you for sub!

[@warrenchen8409]

You can explain the most complex concepts so that anyone can understand. Thank you very much

[@sunnyclassroom24]

You are welcome.

[@Daniel_CLopes]

Mr. Sunny, the contents of your youtube account are valuable. It was nice to find you. Please keep doing what you have been doing.

[@sunnyclassroom24]

Many thanks.

[@SnoiperTV]

amazing video, better explained than almost all books that i read about it

[@barrypringle6717]

Finally I've managed to find a youtube video on this topic which makes complete sense thank you. The graphics explained this very well and now i understand at last

[@ryanwright3965]

This channel is amazing. I subscribed right away!!!

[@mohammadyabroudy2892]

Your lessons are more than perfect... thank you from all my heart. Keep going on.

[@jerichosharman470]

WOW, what an awesome explanation and diagram........and you anticipate the confusion some can have with the message vs signature encryptian

[@sunnyclassroom24]

Thanks a lot.

[@aalampratapbedi7890]

Great video mate. The video covers all the key points and is quite easy to understand.

[@saveriomariuzzo320]

Sunny, I hope you the best cause you are the best teacher on Earth. Thank you!

[@Artificial_Intelligence_AI]

bob and alice using cryptography techniques again!!! they are amazing lol

[@gozalliirawan3289]

Thank you for explaining this. I could understand this clearly after watching your video.

[@timmy213213]

This was amazing. Great video. Subscribed!

[@mgracia942]

Really great, concise explanation and was great in combination with your video on Public Key Encryption to wrap my head around this concept better

[@mugume]

Thank you so much Sunny for the time you put in creating these awesome educational material. God bless you.

[@sunnyclassroom24]

My pleasure!

[@throwingninetyeight8631]

I was confused about this, you cleared it right up. Thanks!

[@nitinvarun7041]

Sunny, this is explained very clear and crisp. And common confusion is best explained. Thank you.

[@jjcetece05to09]

Mostly i never comment the videos i see, really worth for watching and got full concept in just 5 mins. Really it's useful

[@gert-janroodehal7368]

Clear! Correct! And to the point! Very pleasant and educational to watch.

[@sunnyclassroom24]

Many thanks for your encouragement.

[@TheCodeTinkerer]

Fantastic short and concise videos descriping very complex concepts ;) You got my subscription!

[@sunnyclassroom24]

Many thanks , Casper, for your great comment and your subscription.

[@Dinesh_Wadhwani]

Mine as well 😊

[@vinuthiagu1t]

Dear Sir, I watched all your videos.Your explanations are very clear , easy to understand and very short and precise to the point.Please continue making videos as such for beginners to learn complex topics.I wish you touch Microsoft Products such as Azure and latest technologies.Once again, thank you for these excellent videos.Never subscribed on first visit to any channels.But i did for your channel

[@prabhatbhalla]

thanks for explaining this concept in such a concise way.

[@yingwang5659]

I think you have just literally saved my life. Your demonstration and explanation have helped me so much in understanding these ALIEN computer language. I mean, English is my second language already and these computer languages were too hard for me to comprehend....Until viewing your videos. Thank you so much sunny.

[@sunnyclassroom24]

You are very welcome! I am glad I could help. English is my second language too and thus pictures and diagrams always help to understand better than just words. That is why I do this to help others.

[@yingwang5659]

Sunny Classroom your language is Perfect to me and the pronunciation is very clear. Your explanation is straight to the point. It is done well constructed and very logical. Concise and clear. Just what I want. Keep up the great work. The world is better with your contribution💚

[@sunnyclassroom24]

Many thanks for your encouragement. Best wishes, sunny classroom.

[@jamesmorgan4019]

Your explanations are incredibly easy

[@mattredgate5740]

great video, thank you very much! Easy to understand and explains digital signatures well.

[@markanthonypinon4829]

Professor Messor,David L.Prowse, Darril Gibson and Jason Dion couldn`t break it down like you just did. Thank you.

[@riverroad935]

A very good, clear, and simple explanation. Thank you very much.

[@susanjohnson8337]

Crystal clear now. Many thanks, you are a great teacher.

[@mathewkargarzadeh3158]

Excellent Illustration on Digital Signature !!. it is like Juicing an orange and giving everyone an Orange Juice which is a solid understanding of digital signature. Appreciate sharing your know how Sunny !!. Thanks again. Mat.

[@notistsimas1837]

this guy is really good at explaining everything

[@svenskdod]

This guy is awesome! Love it, clear and concise.

[@sunnyclassroom24]

Many thanks.

[@nufufu5558]

Man, I really liked this video and I instantly subscribed to watch more later. I guess what I am hung up on is thinking about where all of this hash comparing is taking place. It must be done behind the scenes.

[@sunnyclassroom24]

thanks for your kind words. Yes, you are correct. A lot of things are happening without user's knowledge.

[@uzmamahfooz2305]

Congratulations, you earned yourself a new subscription. And when I say earned, I mean EARNED. This video was perfectly explanatory!!

[@abadullah955]

Your way to explain is best till found in youtube , Thank You Sunny Class Room

[@sunnyclassroom24]

You are welcome, Abad.

[@pierrevuur8003]

Very good explanation. Also the last remark about data encryption is very clear.

[@sunnyclassroom24]

Thanks a lot for your feedback.

[@rafaele2031]

Awesome, well done my friend Sunny! This video will be full recomended to my friends.

[@sunnyclassroom24]

Thank you very much for your kind words and encouragement. I hope your friends would also like it.

[@tylercgarrison]

interesting that 5 mins in a free video from someone who speaks english as a second language is more helpful than a $500 textbook and a lecture from an expensive institution.. Thanks Sunny, you're awesome

[@davidvergie]

Very nice video! You make things easy to understand!

[@venugopal-kj9mi]

Simple, clear and very easy to understand. Very effective presentation. Thank you

[@sunnyclassroom24]

You are welcome! And thank you for your comment.

[@Boyarsskiy]

Very nice channel. Clear and short videos - you can mix it for understanding what you want. Thanks!

[@Ladynatalie33]

Great Explanation. Thank you so much for this!

[@vidyakrishnan1757]

okay, third video today, I'm officially addicted to your channel :)

[@sunnyclassroom24]

Thank you very much! I appreciate it!

[@RN-uo2vo]

Thank you for the terrific video. Great job Sunny!

[@sunnyclassroom24]

You are welcome!

[@pianoshaman2807]

Hi, this is really really helpful. I can't tell you how much this video helped me.

[@sunnyclassroom24]

I am glad it is helpful. Thanks a lot for taking time to leave comment.

[@garyraphael4162]

Enjoy your videos. Easy to follow and understand

[@ppvshenoy]

Awesome and clear explanation as always. Thanks you.

[@usamazahid1]

wow, beautiful illustrations and explanation....very simple

[@TechPoint56]

Finally understood digital signature after many videos. This is the best .

[@sunnyclassroom24]

Thanks a lot for your nice comment. I am glad it helped.

[@tariqaziz6586]

I would say an excellent explanation. Neat and clean with visuals

[@sunnyclassroom24]

Many thanks, Tariq for your watching and leaving comments.

[@nairrohit83]

A very precise and simple explanation...thank you!

[@sunnyclassroom24]

thanks.

[@cybrainx72]

Best explanation for Digital signature!!

[@diptanshug007]

simplest explanation of complex topics salute!

[@sunnyclassroom24]

Thank you for watching!

[@VF5]

Somewhat simple concept, but hard to understand just by reading textbooks. Thanks for this vid.

[@morriszhang929]

thank you sunny for your videos! always helpful

[@shankarm2012]

That was an awesome ,simple & vivid explanation !

[@sunnyclassroom24]

Thank you for leaving nice comment.

[@ranagadhi2963]

@@sunnyclassroom24 I've questions, what is your email ?

[@vnsarode]

very simply explained! thanks Sunny !

[@sunnyclassroom24]

You are welcome Vikram! And thank you for leaving comments.

[@nikolaborkowski9942]

OMG! I DON"T BELIEVE THAT I"VE FOUND THE GREATEST EXPLANATION! THANK YOU SO MUCH!

[@sunnyclassroom24]

Glad it helped!

[@mixupcalledkhichri7752]

today there was my ppt i was very upset how to explain. Then i pray O Allah help me and finally i watch your video . Thanks to my Allah .. Thanku sunny everything is crystal clear..

[@Fman261]

Your videos are wonderful! Thanks so much!

[@jamesy6213]

This is much better than my book, thank you so much!!

[@HectorGonzalez-vp1ss]

This is amazing, didn't know cryptography was so beautiful

[@sunnyclassroom24]

Thank you for watching!

[@gregorymompezat2261]

this is a very clear explanation thank you

[@wandjlaye_godwe]

At 4.20, he debunks one of the digest confusion peoples are running into - a digital signature is NOT used to encrypt application data. Great job Sir!

[@sunnyclassroom24]

You are welcome !

[@brunobalbino7461]

JSUT PERFECT...Clean explanation

[@tauhidurrahman9996]

good explanation and easy example, thank you Sunny sir.

[@sunnyclassroom24]

You are welcome!

[@jaisrisubramani1991]

Great video which will explain the functionality of digital signature without any complexity

[@kubranilgunkaraca]

It couldn't be more clear. Great explanation.

[@sunnyclassroom24]

Thank you!

[@amolghodmare764]

thanks sunny for this quality video,i am expecting to many videos from you in near future

[@sunnyclassroom24]

Many thanks for your encouragement. I will do more.

[@dombivliwebsite9181]

almost 100's of video are there in you tube. Your explanation was so great.

[@sunnyclassroom24]

120 videos by now.

[@FaizanKhan-dp3sr]

Extra ordinary Teaching style you have !

[@nikitabele9228]

This guy makes my day..nicely explained ...thanks dude

[@sunnyclassroom24]

You are welcome