Resumen
The objective of this research was to suggest some simple solution to increase database manipulation security. Based on advantage of Homomorphic encryption, user?s data in database is always encrypted by Homomorphic encryption algorithm such as Paillier. User?s data is manipulated or processed on many times such as addition, subtraction, multiplication and division. By the advantage of Homomorphic encryption algorithm, user?s data were no need to decrypt while it was manipulated therefore secrecy of data was still reserved. Unfortunately, Paillier?s Homomorphic encryption is normally coverage only addition and multiplication mathematical data operation. This paper suggests simple technique to enhance Pailler?s encryption algorithm to perform data operation as well in subtraction and division operation. Evaluation in suggested data base manipulation, DSM-PHE, indicates that its operation tasks was five operation times more than ordinary data base manipulation operation tasks, without any encryption. Therefore DSM-PHE should be especially used in more sensitive data.