Cloud computing key management scheme based on covert mapping combined public key

In order to guarantee the security of cloud computing,based on the analysis of cloud computing security requirements and elliptic curve cryptosystems,this paper proposed a covert mapping combined public key management scheme that was suitable for the distributed cloud computing.It made detailed description of the process of key management,such as key initialization,key distribution,key agreement,key update and key revocation.The analysis results show that the scheme can solve the problem of large scale keys storage and management correctly and efficiently,has high scalability,can resist collusion attack and ensur the security services provided by cloud computing.