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。

youdao

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》

As nanotubes may have medical applications, making them safe is key.

由于纳米管可能具有医疗应用价值，使之变得安全是关键。

youdao

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

Whether Pakistan's leaders were ignorant of his whereabouts or chose to be ignorant or were complicit in keeping him safe is the key question.

WSJ: In bin Laden Wake, U.S. Faces Bigger Challenges

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