The resulting encrypted string is passed as a post parameter in the URL.
CTF — Hacker101 — Encrypted Pastebin | by Ravid Mazon | CyberX | Medium hacker101 encrypted pastebin
The first flag is often a lesson in paying attention to server responses. By intentionally corrupting the post parameter—such as deleting or modifying a single character—the application may fail to decrypt or unpad the data. Improper error handling. The resulting encrypted string is passed as a
Before decoding, the application replaces standard Base64 characters: ~ for = , ! for / , and - for + . 2. Flag 0: Information Leakage via Error Messages Improper error handling
The is one of the most technical "Hard" level challenges in the Hacker101 CTF . Unlike standard web challenges that focus on common bugs like XSS or SQL Injection, this level centers on advanced cryptographic vulnerabilities , specifically targeting the AES-128 CBC mode .