Cloud computing can provide a flexible way to effectively share data among multiple users since it can overcome the time and location constraints of computing resource usage. However, the users of cloud computing are still reluctant to share sensitive data to a cloud server since the cloud server should be treated as an untrusted entity. In order to support secure and efficient data sharing in a cloud computing environment, Wei et al. recently extended the concept of identity-based encryption (IBE) to support key revocation and ciphertext update functionalities, and proposed a revocable-storage identity-based encryption (RS-IBE) scheme. In this article, we show that the RS-IBE scheme of Wei et al. does not satisfy the correctness property of RS-IBE. We also propose a method to modify the existing RS-IBE scheme.

中文翻译：

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评论“使用可撤销存储基于身份的加密在云计算中安全数据共享”

云计算可以提供一种灵活的方式在多个用户之间有效地共享数据，因为它可以克服计算资源使用的时间和地点限制。然而，云计算的用户仍然不愿意将敏感数据共享到云服务器，因为云服务器应该被视为不受信任的实体。为了支持云计算环境中安全高效的数据共享，Wei 等人。最近扩展了基于身份的加密（IBE）的概念以支持密钥撤销和密文更新功能，并提出了可撤销存储的基于身份的加密（RS-IBE）方案。在本文中，我们展示了 Wei 等人的 RS-IBE 方案。不满足 RS-IBE 的正确性。我们还提出了一种修改现有 RS-IBE 方案的方法。