Mastering AES Sub Bytes Transformation: Step-by-Step Solved Example 🔐

How to solve AES Sub Bytes Transformation | Sub Bytes in AES | Sub Bytes Transformation in AES | Solved Example | AES Sub Bytes | AES Sub Bytes solved example | AES Substitute Bytes

In this video, I have explained introduction of AES. Then explained AES Sub Bytes transformation function. Also solve the example of AES sub bytes (Substitute Bytes) transformation. Complete solution of AES sub bytes transformation (Example from William Stallings book) is in this video. Watch carefully.

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.

0:00 Introduction
0:18 Outline
0:41 Introdcution of AES
2:03 Explain Sub Bytes (Substitute Bytes) transformation function
3:22 Solution of Sub Bytes example (Complete Solution)

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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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