Contents data transmission/reception system, contents data transmitter, contents data receiver and contents data transmission/reception method

A contents data transmitter transmitting contents data, comprising:

• a key information selection part which generates a plurality of key information for encryption and selects a key information among a plurality of the key information;
• a contents encryption part which encrypts an inputted contents data by using the key information selected by the key information selection part;
• and
• a transmitter transmission/reception part which transmits a plurality of the key information, and then the encrypted contents data and a selection information regarding the key information used in the encryption of the contents data to be transmitted, wherein the key information, the encrypted contents data and the selection information are divided to be transmitted through a plurality of signal routes each of which are connected to a contents data receiver in that the encrypted contents data is encrypted by using a corresponding key information extracted among a plurality of the received key information based on the received selection information.

A contents data receiver receiving contents data from a contents data transmitter, comprising:

• a receiver transmission/reception part which receives a plurality of the key information for encryption, a contents data encrypted by using a key information selected from a plurality of the key information and a selection information regarding the key information used in the encryption of the contents data from the contents data transmitter through a plurality of signal routes each of which are connected to the contents data transmitter, wherein the key information, the encryrted contents data and the selection information are divided to be transmitted through the plurality of signal routes respectively;
• a key information storage part which stores a plurality of the received key information;
• a key information extraction part which extracts the key information used in the encryption of the contents data based on the selection information among a plurality of the key information stored in the key information storage part;
• a contents decryption part which decrypts the encrypted contents data by using the key information extracted by the key information extraction part;
• and
• an output part which outputs the contents data decrypted by the contents decryption part.

A contents data transmission/reception method for transmitting and receiving contents data between a contents data transmitter and a contents data receiver, including:

• generating a plurality of key information for encryption in the contents data transmitter and transmitting a plurality of the key information from the contents data transmitter to the contents data receiver;
• selecting one key information from a plurality of the generated key information in the contents data transmitter;
• encrypting a contents data by using the selected key information in the contents data transmitter;
• transmitting the encrypted contents data and a selection information regarding the selected key information from the contents data transmitter to the contents data receiver through a plurality of signal routes each of which are connected to the contents data transmitter, wherein the key information, the encrypted contents data and the selection information are divided to be transmitted through the plurality of signal routes respectively;
• extracting the key information used in the encryption of the contents data from a plurality of the key information in the contents data receiver;
• decrypting the encrypted contents data in the contents data receiver;
• and
• outputting the decrypted contents data from the contents data receiver.