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

Right. Because all of us have probably bought something facebook on Amazon.com or the like, all of us have probably logged into Facebook.com, passing your credit card information over the Internet, passing your username and password over the Internet, and as you probably know, as a casual user, https denotes secure.

对的，因为我们都可能在亚马逊之类的网站上买过东西,我们都可能上过,在网络上传送你的信用卡信息,在网络上传送你的用户名和密码,你可能知道，作为一个非正式的用户，https保护安全。

哈佛公开课 - 计算机科学课程节选