Communications of the ACM
A database encryption system with subkeys
ACM Transactions on Database Systems (TODS)
Executing SQL over encrypted data in the database-service-provider model
Proceedings of the 2002 ACM SIGMOD international conference on Management of data
Cryptography and Relational Database Management Systems
IDEAS '01 Proceedings of the International Database Engineering & Applications Symposium
Providing Database as a Service
ICDE '02 Proceedings of the 18th International Conference on Data Engineering
Practical Techniques for Searches on Encrypted Data
SP '00 Proceedings of the 2000 IEEE Symposium on Security and Privacy
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Cryptographic support is an important dimension of securing sensitive data in databases. But this usually implies that one have to sacrifice performance for security. In this paper, we describe an novel cryptographic schemes for the problem of searching on encrypted character data and provide analysis of security for the resulting cryptographic systems.When the character data are stored in the form of cipher, we store not only the encrypted character data, but also characteristic values of character data as an additional field in database.When querying the encrypted character data,we apply the principle of two-phase query. Firstly, it implements a coarse query over encrypted data in order to filter part records not related to querying conditions. Secondly, it decrypts the rest records and implements a refined query over them. Results of a set of experiments validate the functionality and usability of this approach.