Automotive image sensor, image processing system including the same and operating method thereof
Provided is a method of operating an automotive image sensor, the method including performing a reset operation to set an initialization register corresponding to operation information of the automotive image sensor, receiving a device authentication request from an electronic control unit after performing the reset operation, performing an authentication operation with the electronic control unit based on the device authentication request, obtaining first image data while performing the authentication operation, transmitting the first image data to the electronic control unit while performing the authentication operation, obtaining second image data after the authentication operation is completed, generating a tag for the second image data, and transmitting the second image data and the tag to the electronic control unit.
1 . An image sensor comprising:
at least one processor configured to select one of a first boot mode and a second boot mode; and
a security circuit configured to perform an authentication operation with a host device according to the selected boot mode,
wherein, in the first boot mode, first image data are output to the host device after the authentication operation is performed,
wherein, in the second boot mode, a portion of second image data are output to the host device while the authentication operation is being performed and another portion of the second image data are output to the host device after the authentication operation is performed.
2 . The image sensor of claim 1 , wherein the at least one processor is configured to select the selected boot mode according to a request of the host device.
3 . The image sensor of claim 1 , wherein the at least one processor is configured to store data corresponding to the selected boot mode.
4 . The image sensor of claim 3 , wherein the data are configured to be set by the host device in a reset operation of the image sensor.
5 . The image sensor of claim 1 , wherein the security circuit is configured to be activated according to a security function request from the host device.
6 . The image sensor of claim 5 , wherein the security circuit is configured to generate a tag for integrity verification of image data obtained from a pixel array.
7 . The image sensor of claim 6 , wherein the second image data do not include the tag until the authentication operation is completed.
8 . An image processing system comprising:
an image sensor configured to obtain image data from a pixel array; and
an electronic control unit configured to receive the image data from the image sensor and process the image data,
wherein the image sensor comprises:
at least one processor configured to select one of a first boot mode and a second boot mode; and
a security circuit configured to perform an authentication operation with the electronic control unit according to the selected boot mode,
wherein, in the first boot mode, first image data are output to a host device after the authentication operation is performed,
wherein, in the second boot mode, non-secured second image data are output to the electronic control unit while the authentication operation and key sharing operation are performed and secured second image data are output to the electronic control unit after the authentication operation and the key sharing operation are finished,
wherein the non-secured second image data do not include a security image tag corresponding to the image data,
wherein the secured second image data include the security image tag corresponding to the image data.
9 . The image processing system of claim 8 , wherein the security circuit comprises:
an authenticator configured to perform the authentication operation;
a tag generator configured to generate a tag corresponding to the image data based on a key value shared in the key sharing operation; and
an image area selector configured to select a portion of the image data required to generate the tag.
10 . The image processing system of claim 8 , wherein the image sensor is configured to receive a security function request from the electronic control unit,
wherein the security circuit is configured to be activated in response to the security function request.
11 . The image processing system of claim 8 , wherein the image sensor is configured to determine whether to receive a security function request from the electronic control unit, and transfer the image data to the electronic control unit when there is no the security function request.
12 . The image processing system of claim 8 , wherein the first image data includes the image data and a tag corresponding to the image data.
13 . A method of operating an electronic control unit, the method comprising:
selecting one of a first boot mode and a second boot mode; and
transmitting an authentication request to an image sensor through a communication channel after receiving operation information from the image sensor;
receiving a public key of an automotive image sensor from the image sensor through a communication channel;
generating an encryption code based on the public key;
transmitting the encryption code to the image sensor through the communication channel;
receiving first stream data from the image sensor through a transmission channel in the first boot mode after an authentication operation is completed; and
receiving second stream data from the image sensor through the transmission channel in the second boot mode before the authentication operation is completed.
14 . The method of claim 13 , wherein the first stream data comprises image data obtained from the image sensor and a tag of the image data.
15 . The method of claim 14 , further comprising:
verifying integrity of the second stream data based on the tag.
16 . The method of claim 14 , wherein the tag comprises a message authentication code using a key value corresponding to the encryption code for all of the image data and a portion of the image data.
17 . The method of claim 13 , wherein the communication channel is further configured to transmit and receive data based on an inter-integrated circuit (I2C) interface, and
wherein the transmission channel is further configured to transmit and receive the data based on a mobile industry processor interface (MIPI).
18 . The method of claim 13 , further comprising transferring a reset request to the image sensor to set at least mode register.
19 . The method of claim 18 , wherein the reset request includes a boot selection request to the image sensor,
wherein the boot selection request indicates one the first boot mode and the second boot mode.
20 . The method of claim 13 , further comprising:
transferring a security function request to the image sensor after a reset operation of the image sensor is completed; and
receiving secured image data from the image sensor through the transmission channel after the authentication operation is completed,
wherein the secured image data include an image data and a tag corresponding to the image data.