关键词: 云数据库, 企业信息管理, 隐私字符串

Abstract: This paper presents an effective scheme for encrypting and querying private character sequences in CloudDB. To ensure the security of character sequences in the untrusted CloudDB, the scheme would encrypt the private data in a client-side, and then construct feature index for them. The feature index is constructed based on such steps as subfield partition, subfield domain partition and partition identified assignment, which can capture the key feature information of character sequences and discard non-key feature information, thus has good security and effectiveness. When querying data, the query operations over the private fields would be translated into the new query operations over the corresponding index fields, making them able to be executed correctly over the CloudDB, without the need to decrypt the data, consequently improving the query efficiency. Finally, both theoretical analysis and experimental evaluation validate the security, effectiveness, efficiency and flexibility of the proposed scheme.

Key words: CloudDB, enterprise information management, private character sequence