Lost key. Recovering the registration code using an attack on known text

▤ Summary

This piece explains how to recover a registration code by analyzing a protected Delphi executable. It walks through static analysis with tools like DetectItEasy and IDR, then examines the program’s code path and key generation logic. The article also shows how the software encrypts data using the registration code and a random component. The final takeaway is a practical reverse-engineering method for understanding and bypassing a licensing mechanism.

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