云存储环境下多服务器的密钥聚合可搜索加密方案

密钥聚合可搜索加密不仅可以通过关键字检索密文，还可以减少用户密钥管理的代价和安全风险。该文分析了一个可验证的密钥聚合可搜索加密方案，指出该方案不满足关键字猜测攻击，未经授权的内部用户可以猜测其他用户的私钥。为了提高原方案的安全性，提出了云存储环境下多服务器的密钥聚合可搜索加密方案。所提方案不仅改进了原方案的安全性问题，还增加了多服务的特性，提高了上传和存储的效率，更适合一对多的用户环境。

Multi-server Key Aggregation Searchable Encryption Scheme in Cloud Environment

Key aggregation searchable encryption can not only retrieve ciphertext through keywords, but also can reduce user key management costs and security risks. This paper analyzes a verifiable key aggregation searchable encryption scheme, noting that the scheme does not satisfy keyword guessing attacks, and that unauthorized internal users can guess the private keys of other users. In order to improve the security of the original scheme, a multi-server key aggregation searchable encryption scheme is proposed in the cloud environment. The new scheme not only improves the security of the original solution, but also adds multi-service features, and improves the storage and search efficiency. Therefore, it is more suitable for a one-to-many user environment.