Author:
sovereign

Language:
C/C++

Upload:
2026-01-22 17:58

Platform:
Windows

Difficulty:
4.0

Quality:
4.0

Arch:
x86-64

Downloads:
87

Size:
160.50 KB

Writeups:
1

Comments:
1

Description

Ragnarok is a fun KeygenMe. It implements a custom virtual machine, Yggdrasil, which executes a dynamically generated validation bytecode. The path to Valhalla is guarded by the Heimdall protection system, which watches for unworthy travelers debuggers and subtly corrupts the reality of the execution if detected. Your task is to analyze the VM instructions, reverse the PRNG state generation derived from the username, and solve the linear equations required to generate a valid serial key. Features -Custom VM Architecture: A stack-based VM with custom opcodes (Yggdrasil). -Dynamic Validation: The validation logic changes based on the input username. -Anti-Debugging: Subtle timing and environment checks (Heimdall) that don't crash the program but ensure the math never adds up if tampered with. -Linear Algebra: Requires solving an under-constrained system of equations. Rules 1. No Patching: You must provide a working Keygen (script or program) that generates valid serials for any username. 2. No Brute Force: The search space is too large. 3. Share your solution: A detailed write-up is highly encouraged! Good luck, and may Odin guide your disassembler.

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