那个时候他们用密码相互通信。

During that time they wrote letters to each other in code.

youdao

密码技术是保密通信和信息安全的核心技术。

Cryptography is the kernel of the secure communication and information security.

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在高保密强度的通信系统中，流密码是一种广泛采用的重要技术手段。

In the high security communication system, stream cipher as an important technique is widely used.

youdao

在高保密强度的通信系统中，流密码是一种广泛采用的重要技术手段。

In the high security communication system, stream cipher as an important technique is widely used.

youdao