在“大数据”时代，数据管理成为虚拟学习社区面临的重要挑战，而学习资源的数据安全是数据管理的核心。通过文献研究，得出目前大数据的规模和来源；从学习资源共享和保护两方面，分析了大数据对虚拟学习社区产生的新影响和大数据下虚拟学习社区呈现的新特点以及虚拟学习社区面临的安全威胁和挑战。随着大数据海量信息的爆炸式增长，传统的虚拟学习社区资源保护技术和方法力不从心，结合虚拟学习社区的特点和功能，提出了门限代理签名在虚拟学习社区的应用。协同学习作为虚拟学习社区的一种重要形式，成为人们学习、探索知识的有效方式之一；通过分析大数据时代虚拟社区协同学习的分布式特点、新的演变和组成要素，厘清了虚拟学习社区中协同学习的安全需求，提出了基于门限代理签名的协同学习安全保护方案，以期为大数据时代虚拟学习社区提供安全的网络学习环境做出理论的新探索。%In “Big data” era, data management has become the important challenges faced by the virtual learning community, and the data security of learning resources is the core of data management. Through literature review, the current scale and sources of big data are obtained; and from two aspects of learning resources sharing and protection, the new impact of big data on virtual learn-ing community is analyzed. Besides, new characteristics of virtual learning community and security threats and challenges that virtual learning community is facing are dissected in the paper as well. With the explosive growth of big data, the traditional protection tech-nology and methods cannot solve the problem. Therefore, with the features and functions of virtual learning community, the threshold proxy signature is proposed to be applied into virtual learning community. As a specific form of virtual learning community, collabora-tive learning becomes one of the effective ways to acquire and search for knowledge. By analyzing the distribution characteristics, the new evolution and elements of and by differentiating the security demands of collaborative learning in virtual learning community, one security protection scheme based on threshold proxy signature for collaborative learning is proposed, so as to explore new theories on secure network learning circumstances for virtual learning community under big data.
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