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What is a well known 'public secret' in the industry you work in that the majority of outsiders are unaware of?
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Holly shit, I did PCI IVRs! We were quite paranoid, like you can quess card number by side channel attacks like timings. It's very niche, but fun part of tech world. PCI audits, security, HSMs, etc. Anyway, I never give my CC number 😆