Publication Details

Hardjono, T and Seberry, J, A multilevel encryption scheme for database security, in Proceedings of ACSC-12, University of Wollongong, 1989, 209-218.


An encryption scheme is proposed which allows a hierarchical organization of keys used to encrypt and decrypt data stored in databases. The scheme uses the same method as the RSA cryptosystem [RISH78] to encrypt and decrypt data, with additional restrictions on the availability of the encryption information to the public. Its security is based on the Discrete Logarithm problem [DIHE76] which is known to be NPI. Each user is issued a key which is used for decryption and user clearance verification.