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To enhance the overall safety of cloud service and ensure the data integrity and to ease the burden of monitoring system, cluster analysis is introduced into the paper to divide users into different trust domain. The monitoring system's objects only include special users and users whose trust domain is minimal. The system has function of SMS alarm, and it permits users to recover the data by means of smart mobile phone. The system takes both special users and general users into consideration and ensures the reliability of the service and enhances the experience of users.

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To solve the problem of single sign-on and to realize the destination of fast access, an improved single sign-on system is presented, which is based on the combination between biometric key technology and elliptic curve cryptography. The system analyses the mechanism of status register and verification, which is based on the platform of cloud sign-on. The system needs dual authentication of both fingerprint and password. What's more, it adopts a two-way authentication. So it has strong security, and it can resist replay attack and decimal attack effectively.