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DALLAS — One day last May, Ladar Levison returned home to find an F.B.I. agent’s business card on his Dallas doorstep. So began a four-month tangle with law enforcement officials that would end with Mr. Levison’s shutting the business he had spent a decade building and becoming an unlikely hero of privacy advocates in their escalating battle with the government over Internet security.
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But they wanted more, he said: the passwords, encryption keys and computer code that would essentially allow the government untrammeled access to the protected messages of all his customers. That, he said, was too much.

“You don’t need to bug an entire city to bug one guy’s phone calls,” Mr. Levison, 32, said in a recent interview. “In my case, they wanted to break open the entire box just to get to one connection.”

Recent details revealed after gag order lifted