Decrypt AES Encrypted Data in Python | Full Walkthrough with Code 2025

In this video, you'll learn how to decrypt AES-encrypted data in Python using the exact logic and token used for encryption.

This is the follow-up to my encryption tutorial, and here I break down every part of the decryption process from Base64 decoding to AES key and IV derivation using SHA-256, and finally unpadding the plaintext.

What you'll learn:

How to derive AES keys and IVs from a shared token (e.g. JWT)
How to decrypt Base64-encoded AES-encrypted data
How to recursively decrypt an entire JSON response
How to handle errors gracefully during decryption

Tools Used:
Python 3
PyCryptodome (Crypto.Cipher.AES)
hashlib and base64

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