Through creating the cluster key, the protocol reduces the key storage cost and resolves the problem of high communication cost for key distribution and renewing.

通过建立簇密钥对，降低了密钥存储开销，解决了密钥对建立和更新过程中通信开销大的问题。

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One key focus of cloud storage is cost.

云存储的一个重点是成本。

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In order to decrease the storage cost of group key distribution protocol, a secure group key distribute protocol based on the status key tree is proposed.

为了减少群组密钥分发协议的存储代价，提出了一种基于状态密钥树的群组密钥分发协议。

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Thus encrypted drive key management can be offered as an on-line service, eliminated the cost and complexity of implementing key management for laptops and other storage devices.

FORBES: Creating Security from the Inside Out