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Why 111-1111111 is a valid Windows 95 key

stacksmashing

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Intermediate. Assumes working knowledge.

2M views5 years ago1 recommendation

SecuritySystems programmingReverse engineeringOperating systems

How the Windows 95 CD key validation algorithm works, demonstrated by reverse engineering the setup code in Ghidra.

In this video, we take a look at why 111-1111111 is a valid Windows 95 key. Links: - Ghidra quickstart: youtube.com/watch?v=fTGTnrgjuGA - Jon Sawyer on Twitter: twitter.com/jcase - Patreon: patreon.com/stacksmashing - Twitter: twitter.com/ghidraninja - OEM Key Check: gist.github.com/nezza/a25bee13f25a1733a4c7a1d3d1cf5882 Errata: - In the beginning I say "while I was setting up Windows 98" - The 2 OEM digits are between 95 and 02

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What people say. Recommended as a fun and clear introduction to reverse engineering using Ghidra.

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Why 111-1111111 is a valid Windows 95 key
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