Title: Securely share notes with Encrypted Pastebin — client-side encryption for Hacker101

Ethan quickly wrote a Python script to extract the hidden message from an image provided in the lecture notes. The script revealed a Base64 encoded string, which, when decoded, contained a password: h101St3g0_is_fun .

The goal is to exploit the way the server handles encrypted data to recover sensitive information (the flag) or manipulate the application's logic. 1. Identify the Vulnerability

: The encrypted data is typically passed as a post parameter in the URL.

Even a well‑designed encrypted pastebin has operational pitfalls:

The Hacker101 Encrypted Pastebin embodies several principles from and Privacy by Design :