Method for communication between devices and devices thereof

1. A method comprising:

transmitting, by a first electronic device to a second electronic device, a first public key;

encrypting, by the second electronic device, a second public key based on the first public key;

obtaining, by the first electronic device from the second electronic device, the encrypted second public key that was encrypted using the transmitted first public key;

decrypting, by the first electronic device, the encrypted second public key by using the first public key;

generating, by the first electronic device, a secret key based on a first private key and the second public key;

obtaining, by the first electronic device from the second electronic device, an encrypted network key, wherein a network key is encrypted based on a secret key generated, at the second electronic device based on the first public key and a second private key;

decrypting, by the first electronic device, the encrypted network key by using the secret key;

establishing an encrypted communication channel between the first electronic device and the second electronic device by using the network key; and

performing communication, by the first electronic device, with the second electronic device by using the encrypted communication channel.

2. A first electronic device comprising:

a communication interface configured to perform short-range wireless communication with a second electronic device; and

a hardware processor configured to:

control the communication interface to transmit a first public key to the second electronic device;

obtain, from the second electronic device, a second public key encrypted using the transmitted first public key;

decrypt the encrypted second public key by using the first public key;

generate a secret key based on a first private key and the second public key;

obtain, from the second electronic device, an encrypted network key, wherein a network key is encrypted based on a secret key generated, at the second electronic device based on the first public key and a second private key;

decrypt the encrypted network key by using the secret key;

establish an encrypted communication channel between the first electronic device and the second electronic device by using the network key; and

control the communication interface to perform communication with the second electronic device by using the encrypted communication channel.

3. The first electronic device of claim 2 , wherein the first public key is generated at the first electronic device and the second public key is generated at the second electronic device.

4. The first electronic device of claim 3 , wherein the hardware processor is further configured to generate the first public key by using a random number.

5. The first electronic device of claim 2 , wherein the communication interface is further configured to obtain identification information of the second electronic device together with the encrypted second public key.

6. The first electronic device of claim 2 , wherein

the second public key comprises a plurality of secret keys, and

the hardware processor is further configured to select at least one of the plurality of secret keys.

7. A second electronic device comprising:

a communication interface configured to perform short-range wireless communication with a first electronic device; and

a hardware processor configured to:

control the communication interface to obtain a first public key from the first electronic device;

encrypt a second public key based on the obtained first public key;

control the communication interface to transmit, to the first electronic device, the encrypted second public key;

generate a secret key based on the first public key and a second private key;

encrypt a network key based on the secret key;

control the communication interface to transmit the encrypted network key to the first electronic device;

establish an encrypted communication channel between the first electronic device and the second electronic device by using the network key; and

perform communication with the second electronic device using the encrypted communication channel.

8. The second electronic device of claim 7 , wherein the first public key is generated by the first electronic device.

9. The second electronic device of claim 7 , wherein the communication interface is further configured to obtain identification information of the first electronic device together with the first public key.

10. The second electronic device of claim 7 , wherein

the second public key comprises a plurality of secret keys,

the communication interface is further configured to obtain at least one secret key selected by the first electronic device, and

the hardware processor is further configured to identify whether the obtained at least one secret key is comprised in the plurality of secret keys.

11. A non-transitory computer-readable recording medium having recorded thereon computer program instructions, which when executed by a processor of a first electronic device, controls the processor to:

control a communication interface of the first electronic device to transmit a first public key to a second electronic device;

obtain, from the second electronic device, a second public key encrypted using the transmitted first public key;

decrypt the encrypted second public key by using the first public key;

generate a secret key based on a first private key and the second public key;

obtain, from the second electronic device, an encrypted network key, wherein a network key is encrypted based on a secret key generated, at the second electronic device based on the first public key and a second private key;

decrypt the encrypted network key by using the secret key;

establish an encrypted communication channel between the first electronic device and the second electronic device by using the network key; and

control the communication interface to perform communication with the second electronic device by using the network key.