NETWORK SECURITY - BLOCK CIPHER MODES OF OPERATION 

0:10 - Intro 2:15 - Explanation 4:10 - Electronic Code Book Mode 7:15 - Cipher Block Chaining Mode 12:25 - Output Feedback Mode 19:55 - Cipher Feedback Mode 22:50 - Counter Mode

I've been watching your videos throughout my Computer Security course and I trully thank you for helping me a lot in understanding the topics more!!

This is what I would call a perfect tutorial...Great Work👍 and thank you

I was racking my brain how to complete this chapter! Thank god! I found you on RU-vid!

Explained so well! Thank you

Thank you it is helped me a lot during this quarantine time to understand this chapter nicely !

Sir i can't understand this topic from our professor and after watching this video i can understand clearly all videos related to network security, playlist is very easy to understand, thank you so much

Just too Good Sir....No words for you....Grand salute to your explanation....So many thanks sir :)

Thank you soo much sir ..... Couldn't imagine of passing CNS without your videos .. :-)

Fantastic explanation Sundeep garu . Many thanks for taking time and sharing your knowledge .

Thank You very much Sir for discuss all the Block Cipher Modes elaborately. It's very helpful.

Very well explained! Loved it.

Really a very helpful video!!! much respect for you , from Nepal!!

All your videos are really helpful .Explanation is very clear and effective. Thankyou so much for your efforts sir

Thanks sir,your sessions are very nice,and you would have explained very well.

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Thank you sir you made this complex topic to be understood in a very easy way.

It's not an exaggeration to say that ur explanation is crystal clear..

Sir you have helped me a lot sir during my exams time. Your explonation is very goood and clear. Keep maintian that sir. You are one of the best teacher in my study career. I was scared about this subject and i found you on youtube. Now i learned lot of subject. Thank you very much sir.

really helpful for my MS. didnt need to open textbook at all.

thak you so much sir. I see every vdo of u. Network security topics when i see in book, it feels like i am not getting a singl word. But once i see a single vdo of u, i feel very satisfied with that topic. Thank you sir. U r doing a grt job. Keep it up and u will keep getting more blessings. God bless u.

Sir you are amazing , i have written exam very well because of u

Thank you..... Awesome... Simple, clear, concise and precise...

Insane explanation 👏

Good explanation. At the university we had to make a block cipher written in python, they are fun to write and recommend anyone in the security field to write one to gain a good understanding of them.

Thank you. Really good explanation.

Best explaination...Thank you so much Sir..!!👍👍👍

You made this interesting. Thanks

Great explanation, thanks)

VERY MUCH USEFUL PROFESSOR

Super sir, all concepts are clearly understand. thank you sir

you helped a lot for my exams thanks :-)

Last-minute prep for exams :). So methodically explained!

Well done...slow phase explanation....keep it up..thanks

Excellent work 👌

Your hand writing is amazing

Thank you sir!

sir,because of you wrote exam very well . thank you so much sir,

Clearly explained❤️❤️❤️

Great job

Thank god..... Next week , i have exam ... And i really didn't wanted to waste the hours on this topic.. Thanku so much..👍👍😊

Prepaing for an exam a night before. And, damn, your videos are awesome. Thank you)

1. Don't you lose the 64 - S bits by considering only S bits? 2. In the first step of the shift register, how can you select only S bits? That means during the entire encryption process you will work with S bits.

Greatly explained

You helps a lot sir♥♥

Really a very helpful video sir .. thank u Soo much

Thank you 😊😊😊😊

you are just amazing

Your intro made me low my lappy volume and your voice made me increase the volume.

thank you sir awesome teaching

Thank you sir.

Great!

The way of expression is very interesting ,but what i want to say please take simple plain text as sample message and show how divide the message into block and how we Apply the encryption process!!!

good day Sir. plz give simple example for block and stream ciphers. your explanation is awesome .

nyce explination ..Thanx u soo mch Sir

Thank u so much sir for giving us your precious time ❤️

Thanks alot... awesome explanation

Very well explained sir

Good explanation sir

I want in telugu languge brooo U r explaintion is excellent I want more clear languge so if u can say in telugu that is more useful me and my frds too

Easy for someone to explain it when they understand it well!

Great🙏🙏❤️

thanks a lot sir

Tq you sir for your precious time and valuable explanation

I think there has been a confusion between CFB and OFB , OFB mode operates on full blocks of plaintext and cipher text not on s-bit set while CFB operates on s-bit. Thank you by the way, your videos are very helpful.

Superb sir... Tq very much Sir.. 😍😍😍😍😍😍 ....

I just wrote my data network exam today and it went well because of you sir. Thank you so much.

THANK YOU VERY MUCH.BUT WHAT IS THE PURPOSE OF INITIAL VECTOR

Why we are applying encryption algorithm itself in decryption in ofb?

Nice one sir!

thanku very much

Thank you very much sir

if u are the professor teaching us, no one in the class will fail !

In the output feedback mode, where do the shift register come from?

Thank u so much sir

great

Great work indeed.Sir,i need help in RC6 algorithm.Kindly help me.

Hello Sir, thank you for this video. I loved watching as I understood. I would like to know why for the encryption, the algorithm can't just take the entire plain text in order to transform it into ciphertext? In order words, why does it have to always size the plain text in some fixes blocs? And also, what happens when the last plain text size is inferior to the fixed block size? Does the ciphertext will still remain with the same length? Thank you again and hopefully, I will find answers.

Thank You sir 😇😇

What is counter value? Is it group of bits?

please give some examples of each it makes easy understanding

good lectures

Dear Sundeep, Very well explained. Can you please help me understanding AES CCM mode of operation?

Sir please upload a video on International Data Encryption Algorithm

In chiper block chaining. is the first IV decryption must same with the first IV encryption? please answer me

Sir can you please make a video on frequency analysis of simple substitution cipher

👌👌👌👌

I think you have forgotten to add this video in your network security playlist.

Good work sir

Thankyou sir

Sir! What is counter value. Y we have to choose that in counter mode ?

No idea what this is about, but liking anyway

Sir I have one doubt i.e. You have taken plain text as s-bits it means 8bits, now what is the cipher text size, is it 8bits or 64 bits, if cipher text is 8bits how can we give to the next bock as 64-s and s-bits...

Sandeep very well taught , I had a small doubt in output rate cipher when we have N of block you said counter+N -1 why we have used -1 what it means. Please reply..

Super sir

Sir can you explain how will the block length be equal if we keep on incrementing the counter?

hello sir. bit of confusion regarding OFB. 64 bits of plaintext or 64bits of initialization value? BTW, I am from Bangladesh. And your videos are awesome👌.

Are you God?

Sir.... does the PT of 64bits at xor operation is same as what we taken at IV at top or PT is considered only at XOR stage after encryption??? Plzz clarify.

sir can u explain block cipher principles