ANTI-ATTACKING METHOD FOR PRIVATE KEY, CONTROLLER, STORAGE DEVICE AND COMPUTER READABLE RECORDING MEDIUM HAVING THE SAME

An anti-attacking method for a private key is provided. The method includes using a plurality of storage areas for storing the same security information. The method also includes selecting one of the storage areas as a currently-used storage area for accessing the security information and synchronously updating the security information stored in the other storage areas while updating the security information stored in the currently-used used storage area when generating a digital signature by using a signature rule and the private key. The method further includes selecting one of the other storage areas as the currently-used storage area for correctly accessing the security information when detecting an attack on the security information stored in the currently-used storage area during generation of the digital signature. Therefore, it is possible to prevent the attacker from stealing the private key.