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

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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:
https://youtu.be/-gQrm5j0RkQ

Confusion & Diffusion (Frustrated Statistical Analysis or Claud Shannon Properties):
https://youtu.be/PJrW6ZqQipo

Feistel Cipher Structure (to understand DES):
https://youtu.be/emJ0p6h48u4

Data Encryption Standard (DES) Algorithm:
https://youtu.be/cVhlCzmb-v0

DES Example using Animation:
https://youtu.be/3YBwhWuXZ0o

Strength & Weakness of DES, Avalanche effect in DES:
https://youtu.be/Xy1hver_aaw

Advanced Encryption Standard (AES) Algorithm with structure:
https://youtu.be/X8whYEWoDSI

AES Example using Animation:
https://youtu.be/ZPLEtxxjCYA

Key expansion in AES:
https://youtu.be/14SAn4IEAHk

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