With this distinctive feature, an authorized user can unlock the smartphone simply by speaking a passphrase, without the need to use PINs, passwords or finger swipe patterns.

ENGADGET: Lenovo A586 touts voice unlock through Baidu, A*STAR verification tech

Another legal strategy to complicate matters could be to split the passphrase with another person and claim that you are never in possession of the entire real passphrase.

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Here a magistrate judge ruled that producing the passphrase for the encrypted hard drive would constitute self-incrimination, but on appeal the District Court overturned that decision, holding that decrypting and producing the complete contents would not constitute self-incrimination since Boucher initially cooperated in showing some of the computer files to border agents.

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