The key distribution protocols are important support for safe data communication, but some of them may be attacked again even adopt new safe key after key betrayed.

密钥分配协议是数据安全通讯的重要支持，但是一些协议在发生密钥泄露后，即使用新的安全密钥取代，仍有可能遭受再次攻击。

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The files are now in a safe to which only he has the key.

那些文件如今在一个保险柜里，只有他有钥匙。

《柯林斯英汉双解大词典》

This safe to fail environment is one of the key aspects that makes Pixar so successful.

这种“安全失败”的环境是皮克斯得以如此成功的关键因素之一。

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He wants to live a normal life. To do that he must perform one last job for Saito, a mega tycoon who holds the key to Cobb's safe return to the United States.

VOA: standard.2010.07.20

Knowing how to stay safe and warm is key to staying out of trouble.

CNN: Surviving winter weather: Would you know what to do?

Therefore, forecasting future earnings growth, bought at sound valuations, is the key to safe, sound and profitable performance.

FORBES: Looking to the Future

Organisations that look after the top level domains such as .uk and .de are asking Icann to give guarantees about root server stability, given that billions of dollars of e-commerce now depend on the safe running of these key servers.

BBC: Net's servers under scrutiny