According to one embodiment, an information processing device connectable to peripheral devices for retail transaction processing includes an interface for connecting to a plurality of peripheral devices, a storage unit including an unrestricted storage area and a restricted storage area, and a processor. The processor is configured to acquire device information from each of the plurality of peripheral devices connected to the interface, identify whether the acquired device information meets to a first condition, generate a first key from at least a portion of the acquired device information if the first condition is met, then use the generated first key to unlock a first area of the restricted storage area. The processor then executes a first processing program that was stored in the unlocked first area.