Method of sharing contents by using personal cloud device, and electronic device and personal cloud system

An electronic device comprising:

• a communicator configured to communicate with a personal cloud device configured to share contents with another device;
• a storage unit configured to store the contents;
• and
• a controller configured to control the communicator to determine an upload condition of the electronic device if a new first content is added to a set first folder of the storage unit, and to transmit the first content to the personal cloud device if the upload condition satisfies a set condition.

A method of sharing content in a personal cloud system comprising a first electronic device, a second electronic device, and a personal cloud device, the method comprising:

• connecting between the first electronic device, the second electronic device, and the personal cloud device;
• if a new first content is added to a set first folder of the first electronic device, determining an upload condition of the first electronic device through the first electronic device;
• if the upload condition satisfies a set condition, transmitting the first content from the first electronic device to the personal cloud device;
• storing the first content in the personal cloud device and updating information of a DataBase (DB);
• determining update information of the DB of the personal cloud device through the second electronic device to download the first content from the personal cloud device;
• and
• storing the first content in a set second folder of the second electronic device.

A method of authenticating a user between an electronic device and a personal cloud device, the method comprising:

• inputting a password into the electronic device;
• encoding the password by using a public key in the electronic device;
• transmitting the encoded password from the electronic device to the personal cloud device;
• verifying the encoded password by using a private key in the personal cloud device;
• if the encoded password is verified, generating and storing a session key for a user authentication in the personal cloud device;
• encoding the session key by using the private key in the personal cloud device;
• transmitting the encoded session key from the personal cloud device to the electronic device;
• and
• decoding the encoded session key by using the private key in the electronic device.