See studycoding.org for all tutorials by Shad Sluiter. Explanation and animation showing how the AES block cipher algorithm works
Пікірлер: 103
@Isabellaa-ms5dk Жыл бұрын
the only video that has really helped me understand AES!! thank you so much
@alexandrospanag Жыл бұрын
Dear professor, thank you from Greece! Your guides are awesome and very in-depth and explanatory! Have a good day and thank you for the amazing content!
@george536915 ай бұрын
Same here lmao
@abuk954 жыл бұрын
- You should really mention more that the matrix multiplication (in mix columns) is not in normal arithmetic, but in Galois's finite field (2^8) arithmetic. Not just say "go look it up", because result with normal matrix multiplication are different. - And during key schedule you use Rcon(4) in first iteration, which is wrong. You should use number of iteration for the lookup, so Rcon(1). Visualize the XOR with only first byte, in order to be less confusive. Another iteration for next subkey is Rcon(2) in lookup table and so on. -- yeah, having rcon lookup table would also be better, rather than created vectors from the table. - Other things you are talking about are really clear and i am glad you dedicated time for making this helpful video, thanks!
@maoryatskan63463 жыл бұрын
Still best explanation found
@chetanjoshi39222 жыл бұрын
Gotta say I'm impressed by your counter.. can you tell me some good resources to learn about AES in more detail? I'd be glad!
@marko900003 ай бұрын
also we can and will increase the AES size as needed into 1024 16*16 2bytes *4 or we can use 3 for 4096 or even 4 bytes in encription and use 256*256 which would be AES 65356 :) for the data layer. :)
@jericovillanueva34594 жыл бұрын
Thanks! Really helped alot. Learned more in this 12 mins than my whole semester
@leonard1284 жыл бұрын
hahahah, i think in the same way, you save my life sir.
@netbotcl5864 жыл бұрын
I guess you came here the night before the exam? xD
@Nickola_United Жыл бұрын
students are same everywehere)))
@enaxorgil5352 Жыл бұрын
Easiest explanation I've come across by far. Thanks Sir 💕
@francisonojeharho69282 жыл бұрын
This is the best explanation to AES encryption standard out here
@jaren2kilo3 жыл бұрын
Thank you Shared! This short video really helped to understand the concept in simple way.
@shadsluiter3 жыл бұрын
Great to hear!
@teleport33067 ай бұрын
Tried to litterly find explanation how it works and only you explained the best way possible
@haviettien19144 жыл бұрын
Easy to understand and nice animations. Thank you, sir
@italian_taco12472 жыл бұрын
I am 12 trying to understand AES, this helped! Thank you!
@qin6409 Жыл бұрын
Best video after I struggled on whole KZfaq video
@adamtafesse89714 жыл бұрын
Great overview! Thanks!
@jerlynjohnson79282 жыл бұрын
Excellent presentation!
@sravanakumar9326 Жыл бұрын
Wow, great explanation 🎉
@michellemassaad10133 жыл бұрын
hey professor i am 13 and i am trying to learn how to encrypt using the AES algorithm ,this helped a lot to understand the process thank you
@goyslop-consumer2 жыл бұрын
hey, did figure out how to encrypt pls message me back
@mikewashington4188 Жыл бұрын
Great video. I used the AES algorithm to encrypt and decrypt the contents of a hidden file that stored the password and username of sFTP server used to retrieve data.
@kempisabel99452 жыл бұрын
loved your explanation! thanks so much
@isaacweber7398 Жыл бұрын
NIiiiiiiiiiiiiiiiceeeeeeeeeeeeeeee. Do not stop doing that, professor
@lmaoty3 жыл бұрын
Excellent! Finally understood this!
@shadsluiter3 жыл бұрын
Glad you liked it!
@nursyazwani_41084 жыл бұрын
much more understandable and clear explanation rather than my classmate presentation
@himanshujain7184 жыл бұрын
Best ever explanation of AES! You deserve infinite likes Thank you so much ❤️ Sir!
@tridibroyarjo4183 жыл бұрын
Sir, I did love your video and I am just too young to understand your valuable speech as a 12 Years old. But still, I keep a large interest in Computer Science and Encryption Algorithms. Your lectures are really very much helpful. Thank you, sir!
@shadsluiter Жыл бұрын
Thank you. I hope to see you in class soon.
@whistlingshadow370 Жыл бұрын
What's 14 like?
@ognjenantonic86754 жыл бұрын
Great Explanation
@naumannasir69484 жыл бұрын
very helpful ,easily explained
@lalehalimadadi21294 жыл бұрын
Thanks a lot, your video is amazing! I hope you share us more video.
@muhammadhassan30584 жыл бұрын
The video I wants I found here thanks sir what a great way to explain 😊☺️
@rmabsone81084 жыл бұрын
thank you sir, animation is so helpful
@ismailuwair1873 жыл бұрын
Sir, u saved my life! thank u, sir! I hope i was a student of urs that would make me invincible
@ENZOuwu Жыл бұрын
Thanks you, sir. This helped me a lot
@salissobrachialis3719 Жыл бұрын
Very helpful. Thank you
@james10master4 жыл бұрын
At the end when the Round Keys are being determined from the cipher key, is this process the same regardless of the key size? I ask this because each 'key' is only 16-bytes (128-bits) so does that mean the process is slightly different for 24-byte (192-bits) and 32-byte (256-bit) keys?
@loganbala14502 жыл бұрын
Thanks. This video helped me alot.
@paulinacastillo1166 Жыл бұрын
a good video, i liked so much. Thank for doing this :)
@aurelio35323 жыл бұрын
Beautiful! very easy to understand even if I know nothing about cryptpgraphy. I want to aplly this so baaad
@adedejiemmanuel13 жыл бұрын
Thanks for this lesson. I have a question, what cipher mode is applicable in the AES encryption? By cipher mode, I meant something like ECB, CBC, CTM, GCM, etc.
@SumitKumar-sg9pt3 жыл бұрын
this is exactly what I was looking for. thank you so much professor
@shadsluiter3 жыл бұрын
You are welcome!
@mohammedshaik71134 жыл бұрын
Excellent !
@anjanasanthosh10404 жыл бұрын
Hope u share more videos like this
@ngedrupsamphel90923 жыл бұрын
great tutorial
@the_wizard_exe Жыл бұрын
great video , sr thank you very much
@epaguyeify3 жыл бұрын
Well explained. Thank you
@shadsluiter3 жыл бұрын
You are welcome!
@anjanasanthosh10404 жыл бұрын
Thanku sir,it was of great help
@jxw71964 жыл бұрын
Amazing!
@juangutierrezgomez85962 жыл бұрын
I love it jejejeje great !
@datdang53643 жыл бұрын
thanks you so much, sir!
@davico233 жыл бұрын
very good explanation
@shadsluiter3 жыл бұрын
Glad you think so!
@in2uniform Жыл бұрын
Uh, well, with all due respect… NSA (part of DoD, obv) did not call for replacements to the DES or run the worldwide competition to select the algorithm to be selected to be designated as the Advanced Encryption Algorithm and incorporated into the Advanced Encryption Standard (FIPS 197). That completion was run by NIST, part of the Commerce Department. Now, NSA did decide that, at higher key lengths, when the algorithm is properly implemented, it would be sufficient to classified data up to TS. IMHO….
@techreviewz104 жыл бұрын
How does XOR work on the round key step? can anyone explain?
@578n.jhansisri5 Жыл бұрын
Awesome 😎
@salmanmansha48183 жыл бұрын
it helped alot
@rahulnpr184 жыл бұрын
perfect!
@viddeshk80203 жыл бұрын
Fantastic
@shadsluiter3 жыл бұрын
Thank you! Cheers!
@mohamedkhoulali72674 жыл бұрын
Hi , thanks for the awseome video . i have on question at 9:41 . why you started rotating the bytes from the second row not from the first one .. is this how the AES works or i'm missing something ? Edit: in case someone is interested for the answer i searched and found that the first rows keep unchanged 🙂 have a good day everybody.
@fingolfin97274 жыл бұрын
thanks!
@mohamedkhoulali72674 жыл бұрын
@@fingolfin9727 welcome 🤗
@akhilpandey1539 Жыл бұрын
Hello thanks for the wonderful video. anything about padding?
@csanadselmeczy40664 жыл бұрын
solid
@blockmo22194 жыл бұрын
Could you explain the MixColumns part. Where the matrix come from? And how to calculate to get result? Thank you.
@nielsbuch69034 жыл бұрын
It's a fixed matrix for every encryption. You can find the specific matrix on wikipedia: en.wikipedia.org/wiki/Advanced_Encryption_Standard#The_MixColumns_step
@supertran284 жыл бұрын
I think there’s a mix up at 10:50, not XOR but just adding across
@Atameow4 жыл бұрын
yea true. unless there's something we didn't understand?
@GogsDavies4 жыл бұрын
Nah, it is an XOR. Just so happens that XOR and an add for 04 and a0 has the same result. If you XOR it, it looks like this: Round 1 after MixColumns (showing only Column 1) 04 = 00000100 66 = 01100110 81 = 10000001 e5 = 11100101 RoundKey (showing only Column 1) a0 = 10100000 fa = 11111010 fe = 11111110 17 = 00010111 Now let's XOR them: 04 = 00000100 a0 = 10100000 XOR= 10100100 = A4 66 = 01100110 fa = 11111010 XOR= 10011100 = 9c 81 = 10000001 fe = 11111110 XOR= 01111111 = 7f e5 = 11100101 17 = 00010111 XOR= 11110010 = f2 Which reflects what you see in the first column at the start of Round 2 at 11:17
@shalubansal77383 жыл бұрын
Easy explained
@shadsluiter3 жыл бұрын
Thank you. Are you a computer science student?
@shalubansal77383 жыл бұрын
@@shadsluiter Yes Sir. Not Particularly. I am In 8th grade.
@AmitSingh-ds8yl3 жыл бұрын
What about decryption
@wewlad2964 жыл бұрын
Shad the Lad
@mule_one98602 жыл бұрын
can i get the code of AES?
@joserodriguezalvira11513 жыл бұрын
It's a pity that you skip the MixColumns part in your otherwise excellent presentation. Also, looking up matrix multiplication is not the answer to understanding this step. Thanks for the video, and please consider explaining in detail the MixColums steps.
@TheTrueKailash4 жыл бұрын
😯
@brahimbelmouhand9888 Жыл бұрын
I met Rijmen irl
@IDrankTooMuchMilk Жыл бұрын
Hallo Radboud medestudent
@delowerhossain30692 жыл бұрын
This is called learning and A professor was supposed to be like that. Do you have any python courses, Professor?
@Ahmed_Elhaddad4 жыл бұрын
انا مستغني عن ال 10%
@DrMoonther3 жыл бұрын
no explanation of what happen on each step.
@sikendongol42082 жыл бұрын
XOR is the key
@franatrturcech84844 жыл бұрын
how about doing a decryption-explanation as well?
@alexgear9594 жыл бұрын
Its that but in reverse
@franatrturcech84844 жыл бұрын
@@alexgear959 I know but what is the order? Or how is the MixColumns step, or the key schedule done in reverse? things like that. I see everywhere tutorials and explanations just about the encryption part.
@skapbap97854 жыл бұрын
+1
@christoffer48623 жыл бұрын
Your description of MixColumns was awful. The rest was ok. Apparently a 128-bit key only provides 32-bit security since every single round key is derived from only 4-columns of which 1 is being reversibly obfuscated. It doesn't appear very secure. Figure out the obfuscated 32-bit column through brute-force, reverse the obfuscation and then finally recursively compute the other 3 key columns from the ciphertext, so that they propery match the result of the brute-forced column.
@mohamedsadik54373 жыл бұрын
every body talks about steps in encryption, what about decryption?