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Since its inception, the security of the blockchain technology has drawn all kinds of attention. Although there are some researches on the security of blockchain, there is no specific security study on non-repudiation of this field. In this paper, we introduce the identity authentication ensuring non-repudiation in the blockchain, security and performance of different authentications in blockchain are analyzed too. Then this paper provides a comprehensive introduction to the identity authentication, reviews some special authentication schemes and enhancement solutions of identity authentication proposed by different researchers, and finally suggests some future helpful directions and references toward this field.
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