When Apple introduced the iPhone 5s earlier this month, one of the features it touted was Touch ID, a fingerprint-scanner built into the home button at the bottom of the device. Users may simply touch the home button to unlock their phone and even authenticate iTunes purchases, instead of inputting a custom 4-digit passcode used by previous iPhones.苹果（Apple）本月初发布了新款iPhone 5s，Touch ID技术是其中备受瞩目的新特质之一。这项技术可借助内置于Home键中的指纹扫描设施加密手机。用户仅需轻触Home键就能解锁手机，甚至还能在iTunes上消费，而在此之前，用户需要先在手机上输入四位数的解锁码。But just how secure is Touch ID, really? Is it a nifty gimmick, or truly better security for user data?不过，Touch ID功能真的安全可不可信？它到底是可有可无的新奇玩意，还是用户能真的可以信任的安全管家？Likely the latter. According to Marc Rogers, a security researcher for the mobile security startup Lookout, Apples implementation of fingerprint scanning trumps the old method for myriad reasons. Across both Android and iOS devices, just over 50% of users use the four-digit passcode feature. Having it boosts security, but it also seems many just cant be bothered with wasting a few seconds each time to log in. People see them as barriers, and they try to avoid having too many barriers, explains Rogers.我看是后者居多。移动安全新创企业Lookout企业的安全研究员马克罗杰斯表示，苹果的指纹扫描技术在很多方面完胜传统加密办法。据统计，仅有一半多的Android和iOS用户在用四位数字解锁码。虽然解锁码能提升安全系数，但很多用户都不想在登陆前花几秒钟的时间来输入密码。罗杰斯讲解说：“解码锁让人们看成是一种障碍，而大家会有意识地防止过多的障碍。”Touch ID should make the process easier, at least in theory. Initially, users have to to set up the feature by having their fingerprint scanned and stored on the device -- a process that takes several moments. From every instance on, unlocking the phone means simply pressing the home button as one normally would. If thats the case, more iOS users are likely to turn the feature on. It doesnt add a pesky extra step in everyday user experience: just touch and go.Touch ID能让这个过程愈加简单，至少从理论上是如此。用户仅需在用前花费少许时间，扫描和存储指纹即可。将来，用户仅需像平时用一样，轻轻触碰一下Home键就能解锁手机。假如Touch ID真的可以达到这样成效，我想绝大多数iOS用户都会乐于用这项新功能。用户几乎没增加任何用本钱：只须轻轻点击即可。As for the tech itself, Rogers explains fingerprint scanning as a whole is more secure than the four-digit passcode. Copying someones fingerprints remains a cumbersome process, not to mention pricey -- as much as $200, 000, by some estimates. And at the risk of sounding morbid, using severed fingers apparently isnt an option either. Which is to say, that barring a targeted hack, iPhone 5s owners should rest assured their data is just as secure as it ever was.罗杰斯表示，就整体而言，指纹扫描技术的安全系数要高于传统的四位解锁码。即便在今天，复制指纹依旧是一项异常复杂的工作，更别说它高昂的本钱——有人估算每次本钱高达20万USD。虽然听起来有的变态，但截断的手指也没办法解锁iPhone。（不过，它还能辨别猫爪。）这就是说，除非遭遇有针对性的攻击，不然Touch ID绝不比之前的安全技术差，iPhone 5S用户完全可以放心。Its your phone -- were not launching missiles here, jokes Bruce Schneier, a security technologist. Were looking for a little bit of security, and I think Touch ID is a really great idea for that.安全专家布鲁斯施耐尔调侃说：“大伙的手机里又不会有哪些国家机密，对一般人而言，Touch ID的安全性足够了。”
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