While unsurprising, documents showing that ISIS explicitly directs its followers to Apple's encrypted features are likely to intensify the already mounting pressure on Silicon Valley's major players to work with the government on decrypting data for investigators.
The tech community has long argued that unbreakable encryption is vital to ensuring digital rights and protecting personal information from hackers and government spies. Others have also argued that American tech firms would lose business to overseas companies if consumers knew the government had been ensured access to their data.
The studies I've seen is that islamist Terrorists gravitate to Android phones because they can make apps to do what they want and load them easily on their devices. . . and they can buy cheap burner phones.