Information leakage becomes a social problem. Information leakage may be given a huge damage to a company or individual. So we need security software to protect our information (data,file). There are much security software for PC, but little security software for mobile device. USB Flash Security is security software for mobile device. It can help you to protect you mobile devices by encryption(AES256bit). AES encryption which is recognized by speedy and cipher strength of 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' for personal user. USB Flash Security (Free) USB Flash Security+ (Product) USB Flash Security++ (Product) USB Flash Security# (Product) USB Flash Security## (Product) Main differences of each edition are the disk capacity and the number of USB drives. USB Flash Security+ can be installed to ONE USB drive up to 4GB. 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 of [USB Flash Security+]. So the result of encryption will be changed by password. Anyone who does not know the password can not analyze the data. When install USB Flash Security+ on USB drive, two areas will be made on 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 run "Release tool" and input password, "Protected area" can be accessed and data in this area will be protected by password (encryption). USB Flash Security+ has some convenient functions as password change, disk format, register user info, ect.