An information leak becomes a social problem.It may be given a huge loss to a company or individual by an information leak. So we need security software to protect our property.There are much security software for PC, but little security tool for a mobile device.USB Flash Security+ is a security tool for mobile devices.It can help you to protect you mobile devices by encrypting(AES256bit) it.AES encryption which is recognized by speedy and cipher strength in encryption algorithm has been adopted. Data will be encrypted automatically by writing in USB memory, and it will be decrypted automatically by reading from USB memory.There are five editions in \'USB Flash Security\'.USB Flash Security (Free)USB Flash Security+ (Product)USB Flash Security++ (Product)USB Flash Security# (Product)USB Flash Security## (Product)The main difference of each edition is the disk capacity and the number of USB drives. USB Flash Security+ can be installed to ONE USB drive less than 4GB. Even if uninstall USB Flash Security+ from one USB drive, it can be installed to the other one. About encryption of USB Flash Security+, all of the information(file name, folder name, data file ect.) in Protected Area is encrypted. So it can not be conjectured even find the file\' path. Protected Area is encrypted by key which is the passward set by installing [USB Flash Security Ver.3] to USB memory. So the result of encryption will be changed by password. The other one who do not know the password can not analyze the data. When USB Flash Security+ is installed to your USB drive, 2 areas will be made in your USB drive. First area is "Unprotected area". It is about 0.5MB to save "Release tool". Data in this area won\'t be protected. After start the "Release tool" and input password, "Protected area" can be acessed and data in this area will be protected by password (encryption). USB Flash Security+ has some functions like password change, disk format, register user info, ect.