Aiming at the high requirements for security of cloud computing services

it proposes an anonymous authentication protocol in cloud computing

and designs a model that suits identity authentication. The temporary identity of the user was constructed by using bilinear pairings. Besides

the nonce was used to replace time stamps to avoid the problem of clock synchronization. The protocol implements mutual authentication

based on the calculation difficulty of the Discrete Logarithm Problem and the irreversibility of hash function. The protocol is efficient and has the characteristic of high security. It can be applied in distributed cloud environments

which need to protect the users privacy.