How to solve AES Decryption example | AES Decryption Example | Solved Example

How to solve AES Decryption example | AES Decryption Example | Solved Example | How to decrypt data using AES | Solved Example of AES decryption | AES Inverse Transformation Function

In this video, I have explained all inverse transformation fuctions of AES with example (AES decryption process) in this video. Watch carefully. AES Solved example. AES decryption process explain with example.

For decryption, each round consists of the following four steps: Inverse Sub Bytes, Inverse Shift Rows, Inverse Mix Columns, Inverse Add Round Key.
Above steps also called AES inverse transformation function.

AES Inverse Sub BytesTransformation Function:
AES defines a 16 x 16 matrix of byte values, called an inverse S-box, that contains a permutation of all possible 256 8-bit values. These row and column values serve as indexes into the inverse S-box to select a unique 8-bit output value.

AES Inverse Shift RowsTransformation Function:
Rules of Inverse shifting rows,
Row 1 - No Shifting
Row 2 - 1 byte circular right shift
Row 3 - 2 byte circular right shift
Row 4 - 3 byte circular right shift

AES Inverse Mix Column Transformation Function:
AES inverse mix column transformation function is 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 previous transformation function of decryption process.

AES Inverse Add Round Key Transformation Function:
The 128 bits of State are bitwise XORed with the 128 bits of the round key. Inverse add round key proceeds one column at a time.

0:00 Introduction
0:15 Outline
0:45 AES Inverse Sub Bytes (Explain with example)
3:37 AES Inverse Shift Rows (Explain with example)
6:30 AES Inverse Mix Column (Explain with example)
37:25 AES Inverse Add Round Key (Explain with example)

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Block Cipher and Stream Cipher:

Confusion & Diffusion (Frustrated Statistical Analysis or Claud Shannon Properties):

Feistel Cipher Structure (to understand DES):

Data Encryption Standard (DES) Algorithm:

DES Example using Animation:

Strength & Weakness of DES, Avalanche effect in DES:

Advanced Encryption Standard (AES) Algorithm with structure:

AES Example using Animation:

Key expansion in AES:

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How to decrypt data using AES?
AES Decryption Process
AES Decryption Example
How to solve AES decyrption Example
How to Solve AES Inverse Sub Bytes?
How to Solve AES Inverse Shift Rows?
How to Solve AES Inverse Mix Column?
How to Solve AES Inverse Add Round Key?

[sandeep-shaw]

AES Decryption (inverse function)
ShiftRow() -> SubBytes() -> addRoundKey() -> mixColumn()

Awesome series of video for entire AES Algorithm🧡. Crystal clear understanding💡

Thank you sir 🙏

[asikathi]

Awesome explanation... Tq for your video

[aritra]

This is a amazing lecture sir it has clarified every doubts. But Sir please clarify it that we have to do add round key before inverse mix column or after inverse mix column. Please let me know it.

[mishich]

I have seen many lecture videos but your explaination method is superb but i have a little confusion in encryption you used state array table to shift rows but in decryption you used cipher text table. Is it true proceedure or by mistake you did it .kindly explain this sir! I will be very thankful yo you.

[Fatima-gpq]

Is key scheduling of encryption and decryption process is same ?

[yuvashreep]

Sir what is pre defined matrix and how we took round key in add inverse?

[bibo]

Recently I wrote AES128 using c++ builder and both encryption and decryption work fine. However, the Inverse mix column is kind of complex and hardly to understand
the principle how someone can transform the math to in short C language.
Your tutorial of Inverse mix column is very clear, but I cannot transform it like the code found in github.
Could you please explain the C code.

[tejasanthosh]

Can anyone help me in understanding key expansion in aes decryption