Database secure manipulation based on paillier's homomorphic encryption (DSM-PHE)

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 will not be decrypted while manipulated. Therefore, secrecy of data is still kept. Unfortunately, Paillier's Homomorphic encryption normally covers only addition and multiplication operation on numerical data. 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 database manipulation, DSM-PHE, indicates that its operation tasks take five operation times more than ordinary data base manipulation operation tasks, without any encryption. Therefore DSM-PHE shall be especially used in more sensitive data. © International Association of Online Engineering.