On Tuesday, a federal magistrate-judge ruled that Apple must help the FBI break into the phone of one of the San Bernardino shooters. The FBI was unable to figure out the shooter's passcode, which is the only way to get inside his iPhone.
Apple CEO Tim Cook is furious, saying that the U.S. government is trying to undermine the security of its flagship product.
"The government is asking Apple to hack our own users and undermine decades of security advancements that protect our customers," Cook said.
Apple plans to fight the decision, aided by the ACLU.
On Wednesday, the divide was clear: politicians versus engineers.
"The FBI is creating a world where citizens rely on Apple to defend their rights, rather than the other way around," Snowden said Wednesday morning on Twitter.
Late Wednesday, Silicon Valley's powerful tech industry trade group came out in support of Apple too.
"We worry about the broader implications ... of requiring technology companies to cooperate with governments to disable security features, or introduce security vulnerabilities," said the Information Technology Industry Council, which represents Dell, Facebook (FB, Tech30), Google, Hewlett Packard (HPE, Tech30), IBM (IBM, Tech30), Microsoft (MSFT, Tech30), Nokia (NOK) and others.
For years, the FBI has demanded special access into smartphones. Tech companies have refused, instead increasing the security of their customers' data.
Cryptographers, the scholars who build security into technology, have unanimously warned that special access is a dangerous idea. To them, this isn't about security competing with privacy. It's just about security.
Read more: Ex-NSA boss says FBI director is wrong on encryption
Tech companies, like Apple (AAPL, Tech30) and Google (GOOGL, Tech30), have security on their devices to keep everyone out: hackers, governments, even the companies themselves.
But if they're forced to open a door for police, criminal hackers and government thugs can get in too.
This battle over data encryption has finally reached a peak.
Read more: The encryption debate... in 2 minutes
The San Bernardino shooter, Syed Farook, used an iPhone 5C. The FBI has been trying to guess his passcode to unlock it. If they guess wrong 10 times, Farook's iPhone will permanently erase all the data stored inside.
Apple doesn't hold the keys to his device. But the FBI wants Apple to create a special version of its iOS software that will get loaded onto the phone, circumvent Apple's security features and let agents hack it.
Dan Guido, who runs the cybersecurity firm Trail of Bits, explained in a blog post Wednesday that this hack is possible. He said it would work on any iPhone 5C or older model, putting them "at risk when they're confiscated by law enforcement around the world."
Read more: Terrorists hide plans by 'going dark'
Last year, the world's top cryptographers issued a joint paper saying this is a bad idea. CNNMoney asked them if this particular San Bernardino case changes their mind. All seven who responded said no.
Matthew Green, who teaches cryptography and computer security at Johns Hopkins University, fears it's a slippery slope. If Apple complies with the government this time, it'll be forced to in the future.
"I haven't seen any guiding principle that would prevent this from getting out of hand. It could easily result in every American becoming less secure," he said.
Columbia University computer science professor Steven M. Bellovin said that if Apple doesn't resist the FBI, it'll soon face the same pressure from authoritarian and repressive governments like China.
"This makes it much easier for others -- other police departments, other governments -- to demand the same thing," he said.
Bruce Schneier, one of the world's top cryptographers, warned that criminals could also use this kind of special access to break into people's phones to steal messages, photographs and other personal information. If Apple creates a weaker version of its operating system, others will get their hands on it.
Most tech industry executives -- who normally tout privacy -- remained silent Wednesday. WhatsApp cofounder Jan Koum stood out with this message on Facebook: "We must not allow this dangerous precedent to be set."
U.S. Senator Ron Wyden of Oregon, one of the few politicians to rise to Apple's defense, said "no company should be forced to deliberately weaken its products."
(Read more: Manhattan DA says Apple makes terrorism cases 'go cold')
Other politicians pushed back on that idea Wednesday. White House Press Secretary Josh Earnest told reporters that the FBI is "not asking Apple to redesign its product or create a new backdoor to one of their products. They're simply asking for something that would have an impact on this one device."
Leading Republican presidential candidate Donald Trump weighed in too, saying, "we have to open it up." Marco Rubio, who is also vying for the Republican presidential nomination, said Apple should give up its fight and be "a good corporate citizen."
But even those who support the FBI's demands say it's a point of no return. Cyrus Walker teaches at the government-funded Cyber Defense Analysis Center, where he trains federal agents and police how to hack smartphones in criminal cases.
"If Apple demonstrates the ability to get around its own security countermeasures, that bell is rung and can't be un-rung," said Walker.
CNNMoney (New York) First published February 17, 2016: 1:01 PM ET
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