Electronic device, external electronic device and system comprising same

1. An electronic device comprising:

a camera;

a storage; and

a processor configured to:

capture an image comprising authentication information of an external electronic device using the camera,

obtain first information, a type of the first information is a hash value related to a public key included in the image,

store the first information in the storage,

request the external electronic device for second information, a type of the second information is a hash value,

based on receiving second information related to the public key and identification information including a digital signature from the external electronic device,

based on the first information matching with the second information, transmit a public key request signal to the external electronic device based on the identification information,

based on receiving the public key from the external electronic device, compare the first information with third information output by inputting the received public key to a hash function,

based on the third information matching with the first information, identify whether or not the digital signature is signed based on a private key corresponding to the public key received from the external electronic device, and

based on identifying the digital signature as being signed based on the private key, finish authentication.

2. The device according to claim 1 , wherein the image comprising the authentication information includes a QR code.

3. The device according to claim 1 , wherein the type of the first information is at least one of a public key, a hash value related to the public key, a certificate comprising the public key, and

wherein the processor is configured to request the external electronic device for the second information which is the same type as the type of the first information based on the identification information.

4. The device according to claim 3 , wherein the processor is configured to, based on the type of the first information being the hash value and the first information matching with the second information, transmit a public key request signal to the external electronic device based on the identification information.

5. The device according to claim 4 , wherein the processor is configured to, based on the public key being received from the external electronic device, compare the first information with third information output by inputting the received public key to a hash function, and

based on the third information matching with the first information, execute authentication for the external electronic device.

6. The device according to claim 5 , wherein the identification information comprises a digital signature, and

wherein the processor is configured to,

based on the third information matching with the first information, identify whether or not the digital signature is signed based on a private key corresponding to the public key received from the external electronic device, and

based on the digital signature being identified as being signed based on the private key, finish the authentication.

7. The device according to claim 3 , wherein the processor is configured to, based on the type of the first information being the public key and the first information matching with the second information, transmit a certificate request signal to the external electronic device based on the identification information.

8. The device according to claim 7 , wherein the processor is configured to, based on the certificate being received from the external electronic device, compare the received certificate with a certificate obtained based on the public key received from the image, and

based on the received certificate matching with the obtained certificate, finish the authentication.

9. The device according to claim 3 , wherein the processor is configured to, based on the type of the first information being the certificate and the first information matching with the second information, transmit a certificate request signal to the external electronic device based on the identification information.

10. The device according to claim 9 , wherein the processor is configured to, based on the certificate being received from the external electronic device, compare the received certificate with a certificate obtained from the image, and

based on the received certificate matching with the obtained certificate, finish the authentication.

11. A method for controlling an electronic device, the method comprising:

capturing an image comprising authentication information of an external electronic device;

obtaining first information, a type of the first information is a hash value related to a public key comprised in the image;

storing the first information;

requesting the external electronic device for second information, a type of the second information is a hash value;

based on receiving second information related to the public key and identification information including a digital signature from the external electronic device;

based on the first information matching with the second information, transmitting a public key request signal to the external electronic device based on the identification information;

based on receiving the public key from the external electronic device, comparing the first information with third information output by inputting the received public key to a hash function;

based on the third information matching with the first information, identifying whether or not the digital signature is signed based on a private key corresponding to the public key received from the external electronic device; and

based on identifying the digital signature as being signed based on the private key, finishing authentication.

12. The method according to claim 11 , wherein the image comprising the authentication information includes a QR code.

13. The method according to claim 11 , wherein the type of the first information is at least one of a public key, a hash value related to the public key, a certificate comprising the public key, and

wherein the method further comprises:

requesting the external electronic device for the second information which is the same type as the type of the first information.

14. The method according to claim 13 , wherein the executing authentication comprises, based on the type of the first information being the hash value and the first information matching with the second information, transmitting a public key request signal to the external electronic device based on the identification information.

15. The method according to claim 14 , wherein the executing authentication comprises, based on the public key being received from the external electronic device, comparing the first information with third information output by inputting the received public key to a hash function, and based on the third information matching with the first information, executing authentication for the external electronic device.