Outsourcing data to cloud servers is a popular service for data owners, however, how to check the integrity and freshness of the outsourced data is very challenge. Recently, Jin et al. proposed a cloud auditing protocol with full integrity and freshness support for cloud data, unfortunately in this article, we show their proposal is not secure. Concretely, the cloud servers can forge the authentication tag and thus has the ability to forge proof of data possession, which obviously invalidates their cloud auditing protocol. We also give a new cloud auditing protocol and analysis its security and performance. The results show our protocol is more efficient and secure.

中文翻译：

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改进了用于云存储的可公开验证的审计协议

将数据外包到云服务器是数据所有者的热门服务，然而，如何检查外包数据的完整性和新鲜度是非常具有挑战性的。最近，金等人。提出了一种对云数据具有完全完整性和新鲜度支持的云审计协议，不幸的是，在本文中，我们表明他们的提议并不安全。具体来说，云服务器可以伪造认证标签，从而具有伪造数据所有权证明的能力，这显然使他们的云审计协议无效。我们还给出了一个新的云审计协议并分析了它的安全性和性能。结果表明我们的协议更加高效和安全。