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PHP's built-in crypt function implements one-way encryption or one-way hashing.

PHP的内置crypt功能可实现单向加密或单向散列。

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One-way encryption schemes, and crypt in particular, are extremely popular, secure ways of protecting information.

单向加密方案和crypt特别受欢迎。可以使保护信息的方法更安全。

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In January of last year, cybersecurity researcher Travis Goodspeed gave a presentation at the S4 conference in Miami where he described a way to bypass encryption on Zigbee wireless chips, which some smart electric metering systems would use to communicate.

FORBES: Researcher Throws A Wrench In IBM And HP's Sensor Networks

Apple learned this the hard way when their hardware encryption was broken in iOS 4.

FORBES: Can Nokia's Lumia Steal RIM's Security Thunder?

The team froze phones for an hour as a way to get around the encryption system that protects the data on a phone by scrambling it.

BBC: Frozen Android phones give up data secrets