As an Information Security Practitioner, Enthusiast and postgrad Student I would like to thank you for your clear and well elaborated description of DES, and ALL other VIDEOs you have made.

Just wondering, why were you teaching in a jungle?

Hi Dear Professor , Thank you so much for your clear explanation. You have the power to make things simple and clear. I wish you all the best. May the Universe be with you!!

For more info on why 16 rounds are used, "the reason that DES uses 16 rounds appears to be because differential cryptanalysis is more efficient than exhaustive search until 16 rounds are used". In simplified terms, it would be easier to mathematically determine the key than brute-force the algorithm with all possible key combinations, until the algorithm uses 16 rounds, at which point brute-forcing it becomes more efficient.

Precise, easy to follow and just what you need. Thanks a ton for this vid.

It is very useful and clear to understand. I got a good idea how it works. Specially it was very hard to find a good video to understand DES, but because of your video, I got a good idea. Thanks again.

Thanks for your precisely definition for the DES Mr.Samid

WoooW exactely what the teacher must be even without after effect and no other effect soo simple it is soo clear thanks soo much

Great video sir! This gave me a broad idea of des enough to start studying. It did not go super in depth but It taught me something. Thank you

Thanks a lot for the video, it was very easy to understand the content, this is exactly what i was looking for.

Thank you very much Pro. It was great lecture, very accurate and well define. Great work, Please, carry on.

Thank you so much for such clear illustration

Thank you, this was so easy to understand, DES seemed so scary but you made it so easy. God Bless.

Excellent video and easy to follow. Thank you!

Thanks Sir Samid, this was really easy to understand and quite helpful :)

This is excellent! I was not able to understand this on my native language, but very quickly understand yours explanation! Thank you!

Awesome to hear you always mr. gideon ,good lecture and trust me its not boring .

Gideon, you are amazing! Thank you very much for publishing those video!

I didn't need to know exactly how it worked, just a concept. Thank you this was well explained.

Absolutely Loved It Thank youuuuu

Perfect explaination!

Thanks Gideon! well explained, I would add an explanation of how a decryption process is done in such method.

A really nice video with awesome explanation.... thank you sir...

thank you Sir! Great Explanation!

this video has a great vibe

thank you dr for the explanation, really helps me :)

Thankyou sir..! your way of explaination is very good..!

Well explained and found it very useful

The initial permutation T is inversed at the end. The proper notation would be T on the power of (-1) on the end permutation.

Nicely explained. Thank you sir :) :D

Fantastic, thank you sir

Very well explanation sir, Thanks.

Thank you very much!

thanks a lot for the video.... great explanation sir...

Thank you very much sir, clear and neat :)

Thank you, very well undestandable

How do we have 48 bits of plaintext in the subbox while there are 64 bits in the beggining? I don't understand what kind of operation is manipulate here

aftr 5 hrs, we have crypto. exam.....& ur concept is gonna help me a lot, i m sure abt that....thanx :)

absolutely great!

Thank you so much,this is very clear! :)

Thank you master!

When the ciphertext reaches the decryption 'box' on the receiving end, how does it know what transposition was used when encrypting the message so that in can it can decrypt the message correctly. Do they all just have a standard transposition algorithm?

thank you sir for this awesome and helpful video

Excellent, thank you.

Very well said.

Very helpful thank you!😌

Now that AES is the standard, is DES still useful for some applications? - Like your explanations. - many blessings.

this is awesome. You don't even need to beg for Subscribe and Share like others. You are really good Mr.Proffessor.

PERFECT, PERFECT!

Great great work.. WOuld you mind going through DUKPT -derived unique key per transaction

Thank You Sir. :)

Thank you!

Thank you professor

Thx sir awesome tutorial

Thank you sir.. Very clear... :) Great explanation...

Write a detailed note on the Design rationale of Data Encryption Standard with a focus on the design of S-boxes. if u have then plz share a link

Can you teach me about TinyDES? and for example. Thanks a lot!

This is how teaching should be like. Showing what happens before showing mathematics behind it. It slowly creates interest learn to mathematics behind.

saved my semester :D

thank you soo much sir........

billion of thanks Sir

really thank you.

Thank you.

Nice explaination thank youu

thank u sir,it helped me alott :)

super useful for my semester exams

Verry interesting !! Question: If I understand this right,what gives DES its security against decoding(Eve is klistening in) its the central part of DES. The two transposition in front and at end give only some sort of security,if the method of the 2 transpostions is not known. This obviously is the principle os security by obscurity. This leads me to another question: How much of DES is already known (publicly) ? If the principle of the 2 transpostions is already openly known,there seems to bne no security in using them?! ..sorry for my english-not a native speaker-actually from Germany-typos as well I suppose

i have to implement des in software using java sir can u tell me how can i do it

thanks a lot sir

thank u sir that was so helpfull :)

how does DES deal with extra bytes where these bytes couldn't construct a block ??

thank you

awesome..!!!!

Obrigado!

Thank you sir

Lol claps in the end cracked me so badly... Hahaha

Hello sir .. I would like to get your help to understand the MD5 work ..

Awesome....Sir

Awsom explaination ... clap.. clap.. clap...

which is the most secure encryption algorithm in the world?

thanx a lot sir ji

Thank you so so much sir

Hello Professor! You said about slides. What slides do you mean, and where they are located? what site? please could you give me a link to the slides? thanks.

why were there a clapping sound effect at the end?

thanks Gideon

The 16 runs are needed to prohibit differential cryptanalysis attacks.

thank you sir, your explanation was great.

Hey Gideon, Isn't the key 64bits (with 8 bit parity), so the actual key length is 56 bits, rather than 48?

nice explanation Sir, you save my final exam.

best video

Sir how to encrypt the character (ABC) or (ABBC) ? can u clear my doubt sir.!

great

Why 16 rounds? In my opinion, it because of the Internal Key generation which is the internal key will generate by moving to left 1 or 2 bits (Mostly 2 Bits) that means if it already move 16 round (16 x 2 Bits ~ mostly), the key will place like the first key. I think IBM create it 16 round to make the DES more securable.. 😄

Get this man a marker. btw Thank you so much.

Thanks a lot, maybe it's used 16 stages because if its used less, then its need less time to break it in brute force. I don't know, what do you see sir.

You cannot define The Algorithm. It defines you. It's instructs you.

I dont understand how 64 bit goes in, gets mixed with 16 round of 46 bits key and then outcomes a 64 bit, what about the rest of the 18bits??

Started very well but explaining the rounds would have been better with the aid of a block diagram like you did with the other modules.

Ok... Now i need Feistel ;-)

Thank you :)! - Your neighbour from Palestine