"It's only a matter of time before another case comes up on this," said Joseph Hall of the Center for Democracy & Technology, a digital rights group, after the government said it may have found a way to crack the iPhone of one of the San Bernardino attackers without Apple's help.
The decision by federal prosecutors to cancel a hearing set for today "shows the FBI was expecting to get its clock cleaned" in legal arguments to force Apple to provide technical assistance to hack into an encrypted handset, he added.
The case has drawn interest from groups as diverse as Amnesty International and the UN High Commissioner for Human Rights.
A last-minute filing by the Justice Department yesterday said the FBI appeared to have found a way into the iPhone in question with the help of an unidentified "outside party."
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James Lewis, a senior fellow at the Center for Strategic and International Studies specializing in cybersecurity, said the latest developments underscore the limits of encryption.
"If you give people enough resources, they can break in. This is a race between people who write (software) products and people who break them."
Hall agreed, saying encryption "is a practice" that must continually evolve.
"There may be something we consider secure or well encrypted, and you may find a flaw in the future," he said.
"You can see how Apple has managed this," he added, "but that cat-and-mouse game will continue."
Federal prosecutors and Apple spent weeks trading a volley of legal briefs related to the FBI's demand that the tech company help investigators unlock the phone used by Syed Farook, who died in a shootout after the deadly December attacks in San Bernardino, California.
Hall said the FBI apparently hoped to set a legal precedent. "It's hard to think of another case that would be more sympathetic to their cause," he said.
The two sides were waging both legal and public relations battles.