Key management is a critical technology of cryptography system.

密钥管理是密码系统中的关键技术。

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This kind of machine was a combination of electrical and mechanical cryptography system.

这样的机器，是一种电子和机械密码系统的组合。

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This kind of machine was a combination of electrical and mechanical cryptography system.

这样的机器，是一种电子和机械密码系统的组合。

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