Security device for providing security function for image, camera device including the same, and system on chip for controlling the camera device

A method of operating an image transmitting device, the method comprising:

• obtaining a session key to be used for image authentication through communication with an external device;
• selecting a partial region of an image to be transmitted to the external device based on region information representing a position of the partial region within the image;
• generating a tag corresponding to the image by using the session key and data of the partial region of the image;
• and
• transmitting a packet including the image and the tag corresponding to the image to the external device.

A system on chip (SOC) receiving an image from an image transmitting device, the SOC comprising:

• an authenticator configured to check whether the image transmitting device is an authorized device by performing a device authentication process with the image transmitting device;
• and
• an image processor configured to:
• receive, from the image transmitting device, the image and a first tag corresponding to the image,
• calculate a second tag by using data of a partial region of the image and a session key based on region information for selecting the partial region of the image, and
• perform image authentication by comparing the first tag with the second tag.