System and method for providing security to a portable storage device

摘要

A system for providing security to a portable storage device coupleable to a host system and associated methods are disclosed. The system includes a portable storage device random number generator operable to generate a random number for storage in the portable storage device and the host system each time the portable storage device is accessed by the host system. A random number generated in this manner may be used by the host system in a write process to encrypt a logical branch address, a user password, and user data which may be written to the portable storage device as encrypted data and stored in a secure area of the portable storage device. The write process may further include encrypting the random number using a key associated with the portable storage device to generate an encrypted random number, which may be written to the portable storage device and associated with the encrypted data. The random number is not stored in the host system. A new random number may be generated each time the portable storage device is queried. In a read process the host system may decrypt the encrypted random number associated with the encrypted data to be read using the key associated with the portable storage device to generate the random number. The read process may further include using the random number to decrypt the associated encrypted data. Access to read/write processes may be password protected.