A File Protection System Based on a Trapdoor One-way Hash Function

The information protection of database is a crucial challenge in computer science. It ensures that any access to information kept in database is authorized, thus preventing data from unauthorized altering, destroying, and modification. We propose a novel and simple information protection scheme in this paper. The main operations of this system are ceilings and floors functions on integer. The security of our scheme is based on the difficulty on breaking a trapdoor one-way hash function. In our scheme, a database manager needs to conduct an inner product between the protected information and the enciphering key to encrypt a record of the database. On the other hand, the manager is able to decrypt the record by conducting a multiplication and a modulus operation. Key-Words: File protection, Trapdoor one-way hash function, Access control, Privacy