Step-by-Step Guide to Solving an AES Encryption Example 🔐

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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Check out other video on my channel

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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