Security expertise: Callas had designed an encryption system to protect data on a Mac, previously.
Apple Inc, which has resisted pressure from US law enforcement to unlock encrypted iPhones, this month rehired a top expert in practical cryptography to bring more powerful security features to a wide range of consumer products.
Jon Callas, who co-founded several well-respected secure communications companies including PGP Corp, Silent Circle and Blackphone, rejoined Apple in May, an Apple spokesman said.
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