“Hacker101 encrypted pastebin” likely refers to a CTF (Capture The Flag) challenge from Hacker101 (a free web security class by HackerOne) involving an encrypted pastebin-style web app. The challenge often tests your ability to exploit cryptographic weaknesses, not just SQLi or XSS.
In Hacker101’s security training (specifically their "Intro to Bug Bounties" and "Operational Security" modules), the golden rule is: Pipe the data through encryption at the edge. hacker101 encrypted pastebin
When you create a paste, the application redirects you to a URL with an encrypted post parameter (e.g., ?post=BASE64_BLOB ). Try modifying the last character of the Base64 string. “Hacker101 encrypted pastebin” likely refers to a CTF