Cloud storage plays an important role in social computing. This paper aims to develop a cloud storage management system for mobile devices to support an extended set of file operations. Because of the limit of storage, bandwidth, power consumption, and other resource restrictions, most existing cloud storage apps for smartphones do not keep local copies of files. This efficient design, however, limits the application capacities. In this paper, we attempt to extend the available file operations for cloud storage service to better serve smartphone users. We develop an efficient and secure file management system, Skyfiles, to support more advanced file operations. The basic idea of our design is to utilize cloud instances to assist file operations. Particularly, Skyfiles supports downloading, compressing, encrypting, and converting operations, as well as file transfer between two smartphone users' cloud storage spaces. In addition, we propose a protocol for users to share their idle instances. All file operations supported by Skyfiles can be efficiently and securely accomplished with either a self-created instance or shared instance.

中文翻译：

---

使用可共享的社交计算实例增强云存储

云存储在社交计算中扮演着重要的角色。本文旨在为移动设备开发一个云存储管理系统，以支持一组扩展的文件操作。由于存储、带宽、功耗等资源限制，大多数现有的智能手机云存储应用程序不保留文件的本地副本。然而，这种高效的设计限制了应用能力。在本文中，我们尝试扩展云存储服务的可用文件操作，以更好地服务智能手机用户。我们开发了一个高效且安全的文件管理系统 Skyfiles，以支持更高级的文件操作。我们设计的基本思想是利用云实例来辅助文件操作。特别是 Skyfiles 支持下载、压缩、加密和转换操作，以及两个智能手机用户的云存储空间之间的文件传输。此外，我们为用户提出了一个协议来共享他们的空闲实例。Skyfiles 支持的所有文件操作都可以通过自建实例或共享实例高效安全地完成。