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The purpose of this article is to discuss an authentication method for peer to peer (P2P)-based streaming media. Methods of encryption of streaming media data and digital signatures were used to improve the safety of the media. The digital certificate publishing service and management services of live streaming media authentication information are expanded in the live stream system based on P2P networks. Besides, software used in client are extended functions such as application of digital certificates, decryption of the media stream, request for certification in order to be used by the client to the provider of live stream. The live stream was received from P2P-based network, decrypted and played by the client. The security of media has been improved and the protection for live media copyright has been enhanced through this way.