This is not part of the SSL standard, but is highly recommended to prevent a man in the middle attack (MITM).

虽然这不是SSL标准的一部分，但是这个步骤却是高度建议的，它可以防止中间人攻击。

youdao

It's only when the microphone is put in front of the laughing man in the middle that you understand why this video is so funny.

只有当话筒放在前面中间的那个在笑的男人时，你才会明白为什么这个视频会搞笑。

youdao

This protocol is used to provide confidentiality of secure information, such as user credentials and transaction information, and protection from man-in-the-middle attacks.

该协议用于提供安全信息(比如用户凭证和交易信息)的机密性，还提供了防止中间人攻击的保护。

youdao

Jennifer Neiman (NY-man) and her sister Susan Woodhouse opened the bakery about a year ago, right in the middle of the Great Recession.

VOA: special.2010.04.12

The danger would have been that they could then have staged a man-in-the middle attack.

BBC: Google detects fake website ID certificate threat

When the user visits that supposedly secure site, the man-in-the-middle hacker feeds the site the cookie he already downloaded.

FORBES: Twenty-Four More Reasons Not To Trust Your Browser's "Padlock"

These apps failed to implement standard scrambling systems, allowing "man-in-the-middle" attacks to reveal data that passes back and forth when devices communicate with websites.

BBC: Android apps 'leak' personal details