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.

In many instances, the server returns a detailed error trace or a raw dump that contains Flag 0 . This also reveals that the system uses a Padding Oracle , as it explicitly tells you when the "padding is incorrect". 3. Flag 1: The Padding Oracle Attack hacker101 encrypted pastebin

The resulting encrypted string is passed as a post parameter in the URL. The first flag is often a lesson in

Upon entering the challenge, the application claims to use "military-grade 128-bit AES encryption" and asserts that keys are never stored in the database. In many instances, the server returns a detailed