我们会保护你信用卡的账号安全，系统在付账之后不会存储你的账号信息。

Oursystem will not store your credit card number after it processes your payment.

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索菲亚收到一封向她索要信用卡账号的电子邮件。

Sophia got an e-mail asking for her credit card account number.

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而在另一方面，PayPal也允许用户选择使用其他银行账号直接在线支付的做法威胁到信用卡公司。

But on the other hand, PayPal also threatens credit card companies by giving users the option to pay for their online purchases directly from their bank accounts.

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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。

哈佛公开课 - 计算机科学课程节选