Abstract: An encryption key management method includes: receiving a data registration request from a supplier terminal, determining a data identifier associated with the content data, encrypting a master key with a public key of the supplier terminal, and providing the supplier terminal with the master key encrypted with the public key of the supplier terminal, the data identifier, and a key update count value; receiving a subscription application related to the data identifier from a first subscriber terminal, encrypting the master key with a public key of the first subscriber terminal, and providing the first subscriber terminal with the master key encrypted with the public key of the first subscriber terminal and the key update count value; receiving encrypted content data encrypted with the symmetric key and a hash for the content data from the supplier terminal; and transmitting the encrypted content data and the hash to the first subscriber terminal.

Abstract: A data transmission system and method in a physical network separation environment is provided, which includes: a drive device controlling connection switching for one storage medium drive writing or reading a data file on or from a predetermined storage medium; a source-side server executing writing the data file on the storage medium loaded in the storage medium drive, after switching to a connection to the storage medium drive; a clean PC conducting hash value verification and a test for infection of malicious code with respect to the data file that has been written on the storage medium, after switching to a connection to the storage medium drive; and a destination-side server executing reading the tested data file from the storage medium, after switching to a connection to the storage medium drive.

Abstract: The present invention relates to a data transmission system and method in a physical network separation environment. According to an embodiment of the present invention, the data transmission system includes: a drive device controlling connection switching for one storage medium drive writing or reading a data file on or from a predetermined storage medium; a source-side server executing writing the data file on the storage medium loaded in the storage medium drive, after switching to a connection to the storage medium drive; a clean PC conducting hash value verification and a test for infection of malicious code with respect to the data file that has been written on the storage medium, after switching to a connection to the storage medium drive; and a destination-side server executing reading the tested data file from the storage medium, after switching to a connection to the storage medium drive.

Abstract: The present invention relates to an address generating device of a remote smart meter reading system, and a method therefor, the device including: a first MAC address generation unit expressing, in four bits, respective numbers of a meter ID of a watt-hour meter, and then converting the numbers into hexadecimal numbers so as to generate a first MAC address of 48 bits; a second MAC address generation unit generating a second MAC address of 64 bits by adding bits to the first MAC address; a first IP address generation unit expressing, in four bits, the respective numbers, and then converting the numbers into the hexadecimal numbers and adding bits thereto so as to generate a first IP address of 64 bits being used as an interface ID of IPv6; and a second IP address generation unit generating a second IP address using the second MAC address as the interface ID.

Abstract: The present invention relates to an address generating device of a remote smart meter reading system, and a method therefor, the device including: a first MAC address generation unit expressing, in four bits, respective numbers of a meter ID of a watt-hour meter, and then converting the numbers into hexadecimal numbers so as to generate a first MAC address of 48 bits; a second MAC address generation unit generating a second MAC address of 64 bits by adding bits to the first MAC address; a first IP address generation unit expressing, in four bits, the respective numbers, and then converting the numbers into the hexadecimal numbers and adding bits thereto so as to generate a first IP address of 64 bits being used as an interface ID of IPv6; and a second IP address generation unit generating a second IP address using the second MAC address as the interface ID.