Method and apparatus for supporting secure chat

An electronic device comprising:

• a transceiver;
• a memory configured to store a messenger application;
• and
• a processor configured to:
• request a server to create a chat room including a first user and a second user,
• encrypt session keys of the chat room by using public keys of second user terminals based on account information of the second user, and
• send the encrypted session keys to the second user terminals using the transceiver.

A messenger service providing method of a server, the method comprising:

• receiving a creation request of a chat room comprising a first user and a second user from a first user device;
• sending an invitation request of the chat room to second user devices corresponding to the second user;
• receiving an invitation acceptance message indicating acceptance of the invitation request from a first device among the second user devices;
• and
• sending a chat message to the first device such that the chat message received from the first user device is displayed only on the first device.

An electronic device, comprising:

• a display;
• and
• a processor configured to:
• receive an invitation request of a chat room with respect to a user account of the electronic device from an external electronic device,
• receive a chat message, which is sent to only the electronic device among user terminals associated with the user account, from the external electronic device based on occurrence of an acceptance event with respect to the invitation request in the electronic device,
• decrypt the chat message by using a private key corresponding to the electronic device, and
• display the decrypted chat message through the display.