You trust your legacy systems. They’ve been running the backbone of your enterprise for decades. They’re stable. They’re secure. Or so you think. What if I told you that the very code protecting your passwords has been hiding in plain sight, relying on a secret so fragile it makes a house of cards look like a bunker?
Security through obscurity isn’t a lock; it’s a prayer that nobody looks.
Recently, the security researchers at Silent Signal did something IBM probably wished they hadn’t: they reverse-engineered the undocumented cipher behind QSYRUPWD, the API responsible for password hashing in IBM i systems. For years, the exact algorithm was a proprietary black box. The assumption was that if it was secret, it was safe. But when Silent Signal cracked it open, they didn’t find a fortress. They found a custom, undocumented algorithm that relies entirely on nobody knowing how it works.
Let’s be clear: custom cryptography is almost always a terrible idea. When you build your own cipher instead of using proven, peer-reviewed standards like Argon2 or bcrypt, you aren’t protecting your users. You’re just buying time until someone smarter than you gets curious.
A hidden algorithm doesn’t stop hackers; it just stops auditors from telling you you’re vulnerable.
If you’re an IT admin or a security professional, you might be sweating right now. You’ve probably relied on the assumption that enterprise-grade systems come with enterprise-grade cryptography. But the reality is that legacy systems often carry the baggage of a time when ‘proprietary’ meant ‘secure.’ The reverse engineering of this cipher isn’t an attack on IBM; it’s a wake-up call for the entire industry.
Here is the paradox: exposing this algorithm actually makes your system more secure. By dragging this hidden cipher into the light, security professionals can now properly audit it, test its limits, and patch the vulnerabilities that have been lurking undetected for decades. The secrecy didn’t protect the passwords; it protected the flaws.
Sunlight is the best disinfectant, especially for the code we trust to protect our secrets.
The next time you hear that a system is secure because its inner workings are a secret, run the other way. Real security doesn’t hide. It stands out in the open, daring the world to break it. The IBM i cipher has finally been dragged into the light. It’s time we stop praying for obscurity and start demanding transparency.
FAQ
Q: Doesn't keeping the algorithm secret make it harder for attackers to exploit?
A: No. Attackers reverse-engineer systems all the time. Secrecy only prevents legitimate security researchers from auditing the code and fixing flaws before malicious actors find them.
Q: Should I panic if I'm running IBM i systems?
A: Don't panic, but do audit. The discovery means you can now evaluate your actual risk. Ensure you're using the latest, standard cryptographic hashing methods available on the platform rather than relying on legacy defaults.
Q: Is exposing proprietary code actually a good thing?
A: Absolutely. Exposing proprietary cryptography is the only way to ensure it's actually secure. If an algorithm can't survive public scrutiny, it was never secure to begin with—it was just lucky.