How to solve AES example? | AES Encryption Example | AES solved Example | AES Example solution
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- เผยแพร่เมื่อ 19 มิ.ย. 2024
- AES Example | AES Encryption Example | AES solved Example | Solved Example of AES encryption | AES Transformation Function
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In this video, I have explained introduction of AES. Then explained all transformation fuctions of AES with example (Example from William Stallings book) is in this video. Watch carefully. AES Solved example.
Introduction of AES:
AES uses 128 bits of plain text. AES consists of multiple rounds of processing different key bits like,
128 bits key - perform 10 rounds of encryption
192 bits key - perform 12 rounds of encryption.
256 bits key - perform 14 rounds of encryption.
For encryption, each round consists of the following four steps: Sub Bytes,
Shift Rows, Mix Columns, Add Round Key.
Above steps also called AES transformation function.
AES Sub BytesTransformation Function:
First transformation function of AES is called as Substitute Bytes (Sub Bytes). It is also known as forward substitute bytes transformation. AES defines a 16 x 16 matrix of byte values, called an S-box, that contains a permutation of all possible 256 8-bit values. These row and column values serve as indexes into the S-box to select a unique 8-bit output value.
AES Shift Rows Transformation Function:
Second transformation function of AES is called as Shift Rows. It is also called as forward shift row transformation. Rules of shifting rows are as below,
Row 1 ⇒ No Shifting
Row 2 ⇒ 1 byte circular left shift
Row 3 ⇒ 2 bytes circular left shift
Row 4 ⇒ 3 bytes circular left shift
AES Mix Column Transformation Function:
Third transformation function of AES is called as Mix Columns, operates on each column individually. Each byte of a column is mapped into a new value that is a function of all four bytes in that column. Here in this function State Array is Output of Shift Rows function.
AES Add Round Key Transformation Function:
Fourth transformation function of AES is called as Add Round Key. It is also known as forward add round key transformation. The 128 bits of State are bitwise XORed with the 128 bits of the round key. Add Round Key proceeds one column at a time.
0:00 Introduction
0:15 Outline
0:45 Introdcution of AES
2:13 AES Sub Bytes (Explain with example)
5:47 AES Shift Rows (Explain with example)
8:50 AES Mix Column (Explain with example)
32:27 AES Add Round Key (Explain with example)
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watched this one night before examination. Explaned simply with good slideshow. Thank you sir.
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Thanks sir
The best AES video i watched so far
Sorry for late reply...!!!!
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What a great explanation with slide show. Thanks a lot 👍👍
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very good explanation .👍 It is the best video for understanding AES 👍
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Damn, really rigorous! Great explanation.
Your word really motivete me do something extra ordinary...!!!
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could u explain how did we get 47 for 01000111
Awesome vid man - good work
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Literally amazingg ❤❤❤❤
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Also check AES Decryption example: th-cam.com/video/CTqvPze8uv8/w-d-xo.html
Tysm Bhai, u made my day
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Best video.. ❤should have done key expansion also
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thankyou so much
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amazing dear, great explanation
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Thanks 😊
You are welcome...
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Best video
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Also check AES Decryption example: th-cam.com/video/CTqvPze8uv8/w-d-xo.html
Thanku Soo much..I searched all the lectures on you tube..but it was the best❤❤
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Is the round key already defined or we are manually setting it for our project? And X^8 = x^4+x^3+x right? 1 is not there yeah? Like 1 was already there before using irreducible polynomial
Yes it is already defined....else you can defined manually also....
X^8 = x^4+x^3+x+1 is the irreducible polynomial.
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good job
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Sir how did you write S Box permutation table?
will they give the table or prepare our own like the table in video 16*16?
It's a given table by the algorithms, dear
Sorry for late reply...
This table is already defined when AES was implemented.
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From where predefined matrix came? Whether it is given in question or we assume randomly in question?
Can anyone tell?
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Predefined matrix is already defined....
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sir, can u tell me how we got the round key in step 4, and can u please tell me the question for this example
Round key is already given with the question...
This is the encryption process using AES algorithm.
AES Decryption Process: th-cam.com/video/CTqvPze8uv8/w-d-xo.html
In exam, it may be asked find any one value of the 4x4 matrix.
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Sorry for late reply.
Sir, how is x^8 equal to x^4 + x^3 + x + 1 (13:13 in the video) I didn't quite get that?
Hello Lora,
Here I have used the irreducible polynomial theorem concept. So, x^8 is convert into x^4 + x^3 + x + 1.
Why do I have to convert X^8?
Because the maximum power should be x^7.
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@@ChiragBhalodia take 2^8 = 2^4+2^3+2+1 is 128=27?
Sir please make a video on how to generate a 128 bit key
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I think this one is helpful: www.chiragbhalodia.com/2021/10/key-expansion-in-AES.html
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Why does 03 hex binary value keep changing from 0000 0011 to 0000 0110?
Ohhh dear thank you so much for your query.... It was my typing mistake.... I am apolozige for that.....Thank you so much for watching my video in detailed....
Last step ma Round key matrix kasa aii Ya bata da😊
Round key matrix already available form the first step only.
Hii Sir , Vishwa here
Sir what u took the value of 46 in binary is wrong if we convert it into decimal its 70 the binary for 46 is 0010 1110
For example, 47 is hexadecimal value.. So, 4 = 0100 & 7 = 0111. 47 = 0100 0111..... 46 (in hexadecimal) = 0100 0110 (Binary) and 46 (Decimal) = 0010 1110 (BInary)..... You also can check in online converter.... still if you have any query, you can join my telegram group
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Sorry for the delayed reply....
87 to binary is supposed to be "01010111"
I need clarification
87 (in decimal) = 0101 0111
87 (in hex) => 8 = 1000, 7 = 0111 so, 87 = 1000 0111
DES b bta do
I haven't solved example but I have just animated video....
Video Link: th-cam.com/video/3YBwhWuXZ0o/w-d-xo.html
sir
could u explain how did we get 47 for 01000111
47 is hexacecimal value.. So, 4 = 0100 & 7 = 0111. 47 = 0100 0111
@@ChiragBhalodiasir how did we know that 4 =0100 and 7=0111.how to know these values sir?
its just convert into binary number..... Do you know number system???? Binary, Octal, Decimal, Hexa Decimal?????
Es main 10 rounds pory ho gae hain hain sir
No, this one is 1st round only. Still nine rounds are pending.
WHERE IS YOUR ADD ROUND KEY
Please watch the video carefully. All four steps i have preformed during encryption process. Please Share this video with others...
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I’ve never seen a perfect explanation like yours, thank you so much 🤍🤍🤍
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Sorry for late reply...._/\_