Facing challenges from FBI, Apple vows to strengthen encryption even further

An Apple spokesperson declined to comment on the record to Reuters, and wouldn't say how Apple might make improvements. But they did suggest that Apple plans to strengthen its encryption, particularly if it wins its ongoing dispute with the U.S. government.

Two other sources within the company, however, stated that Apple doesn't intend to take things to an extreme where it can't access any device data whatsoever. Reuters used the analogy of cloud storage provider Box, which aims for a "zero-knowledge state" about customer data.

iOS 8 and 9 already offer full-disk encryption, which Apple claims is so tough that it can't supply a key, even when served with a warrant. The FBI is taking a different tack — asking Apple not to unlock Farook's iPhone directly, but to supply a way of disabling the passcode retry limit so investigators can brute-force access. With the limit on, Farook's device is set to automatically erase itself after a set number of failed attempts.

Apple has maintained that if it offers a means around the retry limit, that would compromise iOS security for everyone. The FBI could in theory reuse the code to gain access to any other iOS device, with or without a warrant, and share it with other organizations like the National Security Agency. The FBI has said that its interest is only in Farook's phone.

On the legal front, Apple is expected to call for protection under the First Amendment with the claim that computer code is speech. Under that view, by forcing Apple to write software against its will, the FBI could be seen as trying to compel speech.