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With the development of battle requirements, traditional client authentication based on central station authentication system by wired network can’t meet the need of current demands, which are authentication of both wired clients and wireless clients by internal network having some destroyed network devices. In order to overcome these problems, a new authentication solution is designed based on block chain technology which has features including decentration, consensus mechanism, tamper-proofing and so on. And AES is used to encrypt classified information. Final the result is proved to be valid.