In quantum cryptography, as in most long-distance data transmission, the information is carried by photons, the particles which compose light and other sorts of electromagnetic radiation.

光子是光线和其它种类电磁辐射的构成粒子，同大部分的远距离数据传输方法一样，量子加密法中信息是通过光子传输的。

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As a result of technical advances particularly the Internet and cryptography - the risks of conveying important information can be lowered.

伴随着技术的进步，特别是先进的互联网和密码学技术，使得传递重要信息的风险降低了。

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This mysterious property, known as entanglement, has far reaching application potential in information fields such as quantum cryptography, quantum computation and quantum teleportation.

这个神秘的“纠缠”性质，在通信领域具有深远的应用潜力，如量子密码学，量子计算和量子隐态传输。

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And cryptography involves scrambling information, converting what you a human can read into sort of nonsense that hopefully a bad guy cannot read.

密码包含不规则的信息，它把我们正常人能读懂的东西转化为,希望坏人读不懂的东西。

哈佛公开课 - 计算机科学课程节选

Fast forward mid-semester when we talk about cryptography and scrambling information, we need the ability to express ourselves in words, not just numbers, and we have that already.

回想一下期中的时候，我们讨论过密码学,和一些不规则信息,我们需要话语来表达自己，而不是数字，其实我们已经有了。

哈佛公开课 - 计算机科学课程节选

But in society today, and we'll talk a bit about security topics -- and such throughout the course, for cryptography -- for encrypting things like your credit card information and bank accounts -- you don't use 32 bits, you don't use 64 bits, you generally use 1024 bits, 4,048 bits.

但在当今的社会上，我们将讨论一点安全方面的知识,贯穿整个课程，密码学-,加密一些像信用卡信息,银行账号之类的东西--你不能用32位，你也不能用64位，你通常要使用1024位，4048位。

哈佛公开课 - 计算机科学课程节选