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SSH I'm gonna go ahead and run this command, SSH, This just means making encrypted connection to someone else's server.
运行这条命令：,这样就加密连接到,某个人的服务器上。
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But I know today in my math class, we were learning about the guys who created RSA Public Key Cryptography.
但是今天的数学课上，我们在学习RSA公钥加密算法的创始人。
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If you have some plain text, some message that you want to send, well, you can encrypt it or you can scramble it using a key, a secret key, which might be a physical machine like the Enigma 13 or it might be a number like 13.
如果你有没有加密的文本，你想要寄送的一些消息,你就可以加密它,或者你可以用一个密钥使其变得混乱，那就像一个英格玛的物理装置,或者他就是一个数字。
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It's been encrypted pretty naively, pretty simplistically, but it's actually an English sentence that's been somehow scrambled; but scrambled in a reversible way.
它被天真地，相当简单地加密了，但是它实际上是一个被加密的英语句子,但是加密方式是可逆的。
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If you just scramble a sentence, it's pretty useless because the recipients are never going to be able to reverse the process.
如果你只是加密一个句子，这是毫无用处的,因为收件人没法将这个句子,反加密出来。
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The number that you choose to rotate your letters by is what we call in cryptography, a key.
你选择的旋转字母的数量,就是所谓的加密学，一个密钥。
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You rotate the letters by a deterministic amount, by a fixed number of steps so that the end result is actually something that can be reversed.
你用确定的数量旋转那些字母，通过一个固定数量的步骤,这样，最终结果是可以把它,反加密出来。
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This is a sentence or string phrase that has been encrypted.
这是一个被加密的句子或字符串短语。
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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。
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But the point is that how is Facebook, how is Amazon possibly going to communicate securely with you or your laptop using cryptology if you both have to know the same secrets.
关键是Facebook是怎么样，亚马逊是怎么样安全地和你或你的计算机,使用加密技术进行交流的，如果你们两个都,知道那个同样的密钥。
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But how many of you have ever called Facebook up or called Amazon up and kind of whispered into their ear I'm going to encrypt this with the number 13.
但是有谁听过Facebook或者亚马逊,稍微低声地告诉他们,我将用密钥13加密这个消息？
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So in general, both of these are examples of what we call secret key crypto.
所以通常，这两个都是,加密技术的例子。
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You type at the keyboard words that you want to encrypt.
你从键盘上键入你想加密的单词。
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In Week 2 we'll look at things like cryptography and functions and the tools that by which you begin to assemble solutions to problems; in Week 3 we'll introduce what are generally ; known as algorithms and data structures; mechanisms by which you can solve problems more efficiently, effectively.
第2周,我们学习加密技术及其功能,还会学到一些操作工具,通过这些工具的使用来收集解决问题的办法,第3周,我们将介绍;,算法和数据结构,以及可以更有效地解决问题的机制。
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It's a secret number so that if Julius Caesar scrambled his message with the key 13, well, then the recipient had better know what that number is or realistically, -- and this is why it's kind of hard to buy -- into some of these age old algorithms, -- what would an alternative approach be to figuring out Julius Caesar's messages to his generals if he didn't know that secret number was 13?
它是一个机密的数字，以至于,如果凯撒大帝使用密钥13加密了它的消息，然后接收者最好知道那个数字是什么,实际上--这就是为什么很难,破解这些古老的算法-,有什么变换方法使凯撒大帝的将军,可以解密凯撒大帝的消息，如果他不知道,那个机密数字是13呢？
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So something the Germans used on their U-boats and the output of that is a scrambled message.
德国人在他们的U型潜水艇所用到的东西的输出,是一个加密消息。
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