French parliamentary deputies, defying government wishes, on Thursday voted in favour of penalising smartphone makers
who fail to cooperate in terrorism inquiries, entering a controversy which has pitted the FBI against Apple in the United States.
The move came in the form of an amendment to a penal reform bill which was receiving its first reading in parliament.
The wider bill foresees the end in May of the state of emergency in place in France since deadly jihadist attacks in Paris last November.
Given the government's reluctance to take on the big phone companies in this way, it remains to be seen whether the thrust of the amendment can survive the lengthy parliamentary process which remains ahead of the bill becoming law.
The controversial amendment, drafted by the right-wing opposition, stipulates that a private company which refuses to hand over encrypted data to an investigating authority would face up to five years in jail and a €350,000 ($380,000) fine.
Telecoms operating companies would be liable to lesser penalties, but still up to two years in jail.
The move in France came the day after a broad array of technology firms joined Apple's legal fight on encryption in the United States, warning of a dangerous precedent if the company is forced to help the government break into a locked iPhone.
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Apple has argued that the only way to unlock the phone is to introduce a weakened operating system, which could potentially leak out and be exploited by hackers and foreign governments.
The FBI has argued that by introducing encryption which can lock data, making it only accessible to the user, Apple and others are essentially creating "warrant proof zones" for criminals and others that will cripple law enforcement and jeopardise public safety.