This as-told-to essay is based on a conversation with 41-year-old Chaim Mazal, chief security officer of Gigamon, a cloud security company based in Santa Clara, California. This story has been edited ...

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Chaim Mazal said he wrote a program that could generate credit card numbers when he was 12. Today, he's a cybersecurity executive at a company that secures complex network infrastructures. Mazal now ...