A New Multilevel Database Field Encryption and Authentication Cryptosystem

Abstract

A new field encryption and authentication cryptosystem suitable for multilevel database is presented. In this system, we develop a way of combining the field encryption and decryption scheme with the record-oriented technique such that it possesses their advantages at the same time. It is immune fromt the ciphertext search attack and the plaintext or ciphertext substitution attack, and allows projecttions to be executed and individual field values to be decrypted and authenticated. It is noteworthy that beacuse of the use of random filters in field authentication, the selection operation can be straightforwardly applied without decryption, which can eliminate the exposuer of some unqualified records and will increase the speed of query.