Cloud is the most dominant platform being used by different organizations towards providing service access to their users and customers. Services provided are intended to store and maintain data belongs to the organizations. Access restriction and data access management are identified as key issue at the point of storage management in cloud. The data security in cloud decides the Quality of Service (QoS) performance of the entire environment. Towards this, different approaches available to handle the storage management and access restriction issues. Still, the approaches are not up to the expected range of performance to maximize the QoS performance. Also, the methods faces higher data leakage, security issues as well as higher impact of tampering, which increases the requirement of block chains towards secure data access. To improve the performance, an efficient multi party secure data access management (MSDAM) is presented in this article. The method is focused to provide data handle in different parties which perform authentication on the data update requests. Also, the method distributes the key set and scheme set for different user at different session which is framed according to user centric features. The method initializes key sets and scheme sets to be distributed to the user in a least fact randomization model. Also, the method generates block chains for the user data which is encrypted using User Centric Block chain Encryption (UCBE) scheme where the key and schemes are selected with randomization technique. Similarly, the hash code has been generated using Distancing method. The proposed method improves the performance in all the QoS parameters of the cloud.

云是不同组织用来为其用户和客户提供服务访问的最主要平台。提供的服务旨在存储和维护属于组织的数据。访问限制和数据访问管理被确定为云存储管理点的关键问题。云中的数据安全性决定了整个环境的服务质量 (QoS) 性能。为此，可以使用不同的方法来处理存储管理和访问限制问题。尽管如此，这些方法仍未达到最大化 QoS 性能的预期性能范围。此外，这些方法面临更高的数据泄漏、安全问题以及更高的篡改影响，这增加了区块链对安全数据访问的要求。为了提高性能，本文提出了一种高效的多方安全数据访问管理（MSDAM）。该方法专注于在对数据更新请求进行认证的不同方中提供数据句柄。此外，该方法根据以用户为中心的特征为不同会话的不同用户分配密钥集和方案集。该方法初始化密钥集和方案集以在最小事实随机化模型中分发给用户。此外，该方法为用户数据生成区块链，使用以用户为中心的区块链加密 (UCBE) 方案加密，其中使用随机化技术选择密钥和方案。同样，哈希码是使用 Distancing 方法生成的。