If unauthorized users know anything about the structure of a block of your plain text, they can use that information to decipher the known cipher text block and possibly recover your key.

如果未经授权的用户知道了您的纯文本块结构的任何信息，他们就可以利用该信息来解密已知的密码文本块，并有可能重新获得您的密钥。

youdao

Cagai housing tenants unauthorized alteration of the original structure, the landlord is entitled to recover the house?

房客擅自改造拆改了房屋的原有结构，房东有权收回房子吗？

youdao

If the unauthorized modification, not only will affect the structure of the house, and sometimes will cause some other troubles.

如果私自进行改装，不仅会影响房子的结构，有些时候还会造成其它的一些麻烦。

youdao

In the past, Tang had repeatedly denied the existence of the unauthorized structure.

FORBES: Hong Kong's Tycoons Back The Wrong Horse?

Infrared cameras and other technology monitor for unauthorized activity in sensitive areas of the structure, including doors to equipment chambers.

CNN: Is this the 'safest bridge in America?'