The Research Of Searchable Attribute Encryption Scheme Basedon Access Control Tree For Cloud Storage

The data is usually stored as a ciphertext on the cloud server in order to protect the data security and users' privacy stored on the cloud by enterprises an individuals.In the Keyword searchable encryption scheme,when the user search the ciphertext data stored on the cloud server,The user assigns the search token,the server searches the user for the ciphertext,but the server does not know the keyword that the user searched for.Attribute-based Encryption(ABE)can achieve fine-grained access control through user attributes.The user can decrypt the ciphertext if and only if the user attribute satisfies a pre-defined access policy.The combination of attribute-based access control mechanism and keyword searchable encryption can effectively solve the above problems.This essay will discuss that the Attribute-based Encryption with keyword searchable mechanism.The main works are as follows:1.Based on the attribute based encryption with user revocation and outsourcing key generation and decryption by Lv etc.,an attribute-based searchable encryption scheme for cloud storage is constructed?This essay designs a new index structure and search token that contains keywords,which combines attribute-based access control with keyword searchable encryption to ensure the user's ciphertext decrypted is the message in which they are interested;The scheme analyzes the security from three aspects:data confidentiality,resistance to collusion attack and index structure security.From the experimental results and correlation analysis,we can conclude that the scheme has a better practical efficiency than the original scheme to a certain extent.2.Based on the access control scheme with user attribute revocation and attribute update by Zhang etc.,this essay constructs an Attribute-based searchable with revocation scheme.Firstly,through the attribute for access control combined with encryption with searchable keywords,a new keyword index and search token is constructed in this essay;secondly,the parameters of public parameters,master key and users' private key in Zhang scheme are optimized,according to the change of user attributes,it has an efficient attribute to remove and add methods;finally,according to the complexity analysis and experimental results of the original scheme.In conclusion,this scheme can effectively reduce the computational complexity and is more efficient than the original one.