"One proposal, by Adm. Michael S. Rogers, the head of the National Security Agency, is to develop a split-key system in which companies hold half and the govern

"One proposal, by Adm. Michael S. Rogers, the head of the National Security Agency, is to develop a split-key system in which companies hold half and the government, or some outside agent, holds the other half of the key to unlock encrypted communications. The two would be put together only with approval of a court. But many computer security experts reject that idea, saying it would leave too much room for theft and would motivate other governments to require the same."