Data Encryption Standard (DES) - Explained with an Example - Cryptography - CyberSecurity - CSE4003

[@muhammedozen2699]

That's literally the best tutorial on DES I've ever seen on youtube. So practical and very detailed. thank you so much sir. I highly appreciate your work

[@cybersniffer1]

Look! Everyone on here. From this video, I realized if you don't understand any form of instruction, complex or simple (math, science, logic, etc) it is not your fault. The burden of you understanding a section of instructions or lesson lies largely on the person teaching. Thank God for the internet. If something is not too from your instructor, try learning it from other sources until it is clear. It worked for me. Cryptography has been like a mystery over my years in cyber security. THIS VIDEO right here proves my theory. "It wasn't my fault". @Satish CJ! You've made my years! 🤣 For the rest of my life, I can explain DES to anyone in my sleep! Sorry, this is a long comment.... but AMAZING.

[@SatishCJ]

Glad to know the video helped. I understand it's a long comment.. but it's the best comment I have had so far. Thanks for the nice feedback

[@cosmiccometyt]

Guys, watch the whole video, dont think about the time, it is the best explanation for DES

[@kensenior820]

In my opinion, this video is much easier to follow and much more detailed than other explanations of DES available online. Thank you.

[@VoidExistence]

I thought the comments exaggerated, but this video is *actually* better than the ones by million sub channels. Extremely easy to follow and very practical. Sir kindly never stop making these, you're a blessing

[@SatishCJ]

Thanks for the inspiring feedback. Glad to know you liked the lecture

[@QuickFlicksx]

Best Ever Tuotorial on DES, best ever literally! - idk why is this so underrated....

[@siddaramannas66]

one of the best lecture on DES on youtube. Thank you sir.

[@SatishCJ]

Wow, thank you!

[@3D-Animation-o7m]

Excellent sir kmaal kr diya apny to ❤❤❤love you ❤❤❤

[@SatishCJ]

Thanks for the nice feedback 🙂

[@dananjayafdo7855]

man I appreciate ur time to made this vdo series, no matter how many views u got or what, this information r valuable.cheers!

[@Lamadora808]

... this is exactly what I needed to help me understand DES, thank you for sharing this video.

[@dongdau1151]

This is the best tutorial on DES. Thank you sir, really helpful explanations.

[@gavazzaangelo]

Sir, thank you so much for all the effort and didactics you put on this work. I was trying to find a video that I could understand DES for days and this one saved my assignment and my student life! lol greetings from Brazil!

[@SatishCJ]

Glad to know the video helped.Thanks for the nice feedback

[@monasharon2347]

Sir this is the best video for DES!! Thanks a lot for helping me at the last min of exam preparation :⁠,⁠-⁠)♡

[@SatishCJ]

Glad to know the video helped. Thanks for the nice feedback

[@josiah4812]

Sir your patience is remarkable, thank you for this!

[@SatishCJ]

Glad to know the video helped. Thanks for the feedback

[@aimankhan5905]

bht khoob sir maza a giya asy hi aap lectures upload kiya kry smjany k andaaz bht axcha h apka

[@shreyatarwey7520]

This video is soo helpful, You need much more reach and appreciation than this, You literally helped me out a lott!!! Great work thankssssssss

[@hemangisatam6750]

Thank you sir ...very well explained ...one of the best video on DES algorithm

[@SatishCJ]

You are most welcome. Thanks for the feedback

[@chickduck7522]

Thank you for the effort you put into detailing every step ! I have to code an implementation as part of a school project and it is very very helpful !

[@natarajanyuvaraj5265]

Neat explanation. Grateful I found this first among all other videos.

[@SatishCJ]

Great to hear!.. Thanks for the nice feedback!!

[@nadarjanjeyakumar5063]

Sir. Very nice. Patience in explaining step by step. Long video, but I deserved the time for explanation.

[@Ramadeviramadevi-hy3vq]

Such a wonderful explanation with an example. Thank you so much

[@SatishCJ]

Glad it was helpful!. Thanks for the nice feedback!!

[@akheelakhanum6183]

explained in a very simple way sir.. thnks a lot

[@SatishCJ]

You are most welcome

[@kandi2440]

Really outstanding DES tutorial.

[@SatishCJ]

Thanks for the nice feedback

[@ssambadenis9401]

Geniusly Executed. Thank you , This has been very helpful

[@hitthemill8595]

7:16 - phase1 20:33 - Phase2 39:45 - final stage

[@danp6101]

I think you made a typo in the PC-1 chart. I used it to convert the 64 bit string to a 56 bit string and it was different then the string you showed. there are 2 (21) in the PC-1 chart I changed the second 21 to 12 to get the same 56 bit string you did. I'm not sure if that is the correct number but with the 2 (21) in the chart the 56 bit string will different.

[@bhuvanb2204]

Great Video. Made it very easy to understand

[@SatishCJ]

Glad it helped!

[@thebigvusi3377]

You’re the best man 🙏🏻🔥

[@anandrajam7556]

Very very helpful video, thx for this

[@ChukwunazaekpereObioma]

I enjoyed this. However, I'd like to ask the following questions: 1. How were the values in the S-box table generated? 2. How do you carryout the decryption processes. Thank you.

[@mmllllmm5671]

THANK YOU SOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO MUCH ❤❤❤❤❤❤❤❤

[@VishnuBalaji46]

Thanks for your good lecture. Pls post more videos about cybersecurity

[@vishaalclips]

Thanks a lot for this Sir, very well done lecture :)

[@SatishCJ]

Most welcome! Thanks for the nice feedback 👍

[@kyrostsa1180]

very helpful video!

[@2105avalanche]

Thank you sir, Very helpful explanations

[@saeedkhalili-h8s]

This tutorial was awesome!!

[@SatishCJ]

Glad you liked it

[@mimirizaldo2412]

Thank you sir!! You've saved me from tutorial hell

[@SatishCJ]

Glad I could help!

[@Abhishek-fe3zs]

Hi, what is the point of having 4 separate rows in the S1, S2 etc sboxes? The first and last digit cannot form a value greater than 10 aka 2.

[@aaronl8443]

sir you are very clear on this ty!

[@SatishCJ]

Glad it was helpful!

[@beastimprovement277]

I Don't understand why the size of the key change from 64 bits to 56 when it is permuted. And I'm wondering if the size of the blocks is always equal to 64 bits. If no, I Suppose the Size of the key the be the same as the size of the blocks. And what happens if the size of the key is less than 64 bits? How do we find the size of the subkeys and if it is above 64 bits like 69? How do we determine the key size? Can you put some Documentation to explain the general rules? Maybe that's because I haven't finished to watch the video, but I think you're just showing some usual cases, thanks for your answer.

[@premagrawal5658]

the permutation table is provided in the exam or do we have to carry the tables with us.....and is this permutation tables is common for all problems or different

[@ameypatil2672]

Really helpful!!

[@syedraza5488]

The only Question is that :- All these tables will bi given in paper ? Like PC-1, PC-2, left shift table, right shift , IP , E bit-selection table , S1, S2, S3.....? Are these tables given in question paper???????

[@suryaveeraraghavalu8250]

superb

[@ipsitoarko9872]

Thank you so much sir!

[@miras6508]

there is a mistake in the video. when generating the 56th key from a 64-bit key, the 21st bit will be 0, not 1

[@SatishCJ]

If that is a mistake.. Thanks for pointing it out. I might have missed it while scanning a big string of 0's and 1's. Really glad that you are able to spot such errors. Thanks for the correction

[@miras6508]

oh, sorry, it’s not a mistake, the key is correct. it is a typo in PC1 table. on the last row instead of 21, there should be 12 ^^

[@miras6508]

and because the value of 12 and 21 bits are different, I thought it’s an omission in calculations

[@tesfalegntadesse3737]

Is the value of PC-1 table and pc-2 table constant or given?????? additionally the value of iteration to left shifts is it constant ??? please i need your help to understand!

[@maryjanedizon9275]

Exactly, I also wanted to know. And, searching through the web and some books, he uses the same tables. So, I guess these tables are the convention. There's also a Wikipedia article on this: en.wikipedia.org/wiki/DES_supplementary_material#Initial_permutation_(IP)

[@raghava8561]

Amazing!

[@estifanoscheka2091]

Thank you!

[@seriousname-uh6lq]

in 8:53 the second part of the key+ should be 1110011 instead of 0110011

[@dhadithanujachowdary6422]

Sir,These pc tables are of pre-defined or else we can take of our own

[@ali-r2n7t]

I need help in speck lightweight encryption and key generation thank you so much

[@deepikavarma9695]

sir should we learn all pc tables???this is my doubt sir

[@jubinm007]

Sir could you please explain the design principle of s box & p box

[@inoculati0n]

Question: if there are 64 bits in the key and only 56bits on the PC1 matrix, do the remaining 8 bits on the key just not get used?

[@nathansimon713]

yes they are not used

[@STUDYTALK1102]

How to write pc 2

[@assemabujahal625]

Sir, I need the powerpoint file, please

[@dennisnjeru3995]

What are the steps for DES decryption?

[@ak.karimzai]

same to encryption just you need to encrypt decrypted text with same key, in which you encrypted

[@anubhav5709]

BBS WALO YAHA ATTENDENCE LAGAO

[@emannadeem290]

bestest

[@saigeeta1993]

Sir please share DES notes

[@hemanthreddy2485]

Aced it.

[@mohammadshornab7104]

Sir, who invented this? Please let me know 😡

[@guganshankar4722]

That's literally the best tutorial on DES I've ever seen on youtube. So practical and very detailed. thank you so much sir. I highly appreciate your work