According to an embodiment, a data transfer control device includes a controller, and the controller generates tag information when the controller receives a tag generation request, and encrypts the tag information, transmits the encrypted tag information to a device that transmits the tag generation request, processes data stored at a predetermined address to generate data for transmission when an address at which the data related to the data transfer request is stored includes the predetermined address, scrambles or encrypts the data for transmission using the tag information, and transmits the scrambled or encrypted data to the device.