Privacy-Preserving Cloud Storage (B04)

云存储在数字用户栖息地中扮演着核心角色。然而，它对数据所有者和数据客户都带来了隐私威胁。我们关注两个问题：如何允许细粒度的访问控制，同时对云提供商隐藏访问模式，以及如何在不泄露数据所有者身份的情况下支持数据客户端。我们将研究具有多个数据所有者和客户端的隐私保护外包数据库。这包括：适当的隐私概念，支持这些的密码原语，通过专用功能对（加密）数据的客户端访问，隐私和功能之间的权衡，以及最小的密码假设。我们将研究我们的技术在公共日志设置中的应用。

Cloud storage has gained a central role in digital user habitats. Yet, it incurs privacy threats for data owners and data clients alike. We focus on two questions: how to allow fine-grained access control while hiding the access patterns from the cloud provider, and how to support data clients without revealing data owner identities. We will investigate privacy-preserving outsourced databases with multiple data owners and clients. This encompasses: appropriate privacy notions, cryptographic primitives supporting these, client access through dedicated functions on (encrypted) data, trade-offs between privacy and functionality, and minimal cryptographic assumptions. We will investigate the application of our techniques to the setting of public logs.