An internet protocol, IP, camera security system allowing secure encryption information to be transmitted, comprising: a plurality of IP cameras configured to capture a surveillance zone-specific IP camera image; an image storage device connected to the plurality of IP cameras by a network and configured to receive and store the surveillance zone-specific IP camera image captured by each of the plurality of IP cameras; and at least one client terminal connected to the image storage device by a network and configured to receive and reproduce the surveillance zone-specific IP camera images stored in the image storage device, wherein the image storage device transmits a unique encryption key of the image storage device and an encryption method to an IP camera of the plurality of IP cameras connected to the image storage device by the network and one of the at least one client terminal such that an encryption key and an encryption method are managed not by the IP camera and the client terminal but by the image storage device, wherein the IP camera image is encrypted using the unique encryption key of the image storage device and the encryption method, wherein the client terminal decrypts the encrypted IP camera image using the unique encryption key of the image storage device and the encryption method, wherein the unique encryption key and the encryption method are transmitted through a security session separated from a data transport session for transmitting an encrypted image such that secure transmission of encryption information is achieved, wherein the security session between the image storage device and the IP camera is used for negotiation of the encryption method, and wherein the image storage device does not perform encryption and decryption, thereby preventing the performance of the image storage device from being degraded. a plurality of IP cameras configured to capture a surveillance zone-specific IP camera image; an image storage device connected to the plurality of IP cameras by a network and configured to receive and store the surveillance zone-specific IP camera image captured by each of the plurality of IP cameras; and at least one client terminal connected to the image storage device by a network and configured to receive and reproduce the surveillance zone-specific IP camera images stored in the image storage device, wherein the image storage device transmits a unique encryption key of the image storage device and an encryption method to an IP camera of the plurality of IP cameras connected to the image storage device by the network and one of the at least one client terminal such that an encryption key and an encryption method are managed not by the IP camera and the client terminal but by the image storage device, wherein the IP camera image is encrypted using the unique encryption key of the image storage device and the encryption method, wherein the client terminal decrypts the encrypted IP camera image using the unique encryption key of the image storage device and the encryption method, wherein the unique encryption key and the encryption method are transmitted through a security session separated from a data transport session for transmitting an encrypted image such that secure transmission of encryption information is achieved, wherein the security session between the image storage device and the IP camera is used for negotiation of the encryption method, and wherein the image storage device does not perform encryption and decryption, thereby preventing the performance of the image storage device from being degraded.