关键词: 区块链, 安全风险, 安全机制, 数据保护, 隐私保护

Abstract: Blockchain is characterized by high integrity, collective maintenance and openness and transparency. They are regarded as subversive innovations in computing mode after mainframes, personal computers and the Internet. They are expected to promote the evolution of information Internet into value Internet and orderly Internet. Blockchain has gradually extended from a single application of digital money to various fields of economic and social, including finance, notarization, social networking, health care, supply chain, Internet of things and so on. Blockchain has a positive impact on various fields, but they also face attacks from internal and external entities. Based on the block chain function view model, this paper analyzes the technical risks of block chain application in detail. In view of the above risks, the functions and limitations of the existing security mechanisms are analyzed. Combined with the technical security risks and security requirements of blockchain application, the corresponding technical improvement direction suggestions are put forward, which provides important reference for the development of blockchain technology in the future.

Key words: blockchain, security risk, security mechanism, data protection, privacy protection