A new hierarchical file encryption system based on smartphone

With the development of Mobile Internet, the smart phones become more and more popular. So a lot of people choose to store personal information directly on the Smartphone. It usually leads to important personal information leakage because of the relatively weak security mechanism of the smart phone. Therefore, this paper presents a hierarchical file encryption system base on Smartphone which uses the modified Blowfish encryption algorithm. We proposed a strategy for the storage of encryption key and a hierarchical encryption mechanism for the encryption efficiency. This system has a good improvement in safety and time efficiency compared to the general encryption system.