Communication Device, Communication System and Program

A communication system, comprising:

• a plurality of communication devices connected to a network, each of the communication devices being configured to transmit data to which a predetermined security level is set to another communication device,
• wherein the communication device includes:
• a security level determining unit configured to determine a necessary security level to transmit the data in accordance with the security level set to the data;
• a security setting unit configured to re-set the security level that is determined by the security level determining unit to the data;
• a security procedure executing unit configured to apply a security procedure to the data so that a requirement of the security level set by the security setting unit is satisfied;
• and
• a data transmitting unit configured to transmit the data to which the security procedure has been applied.

A communication system, comprising:

• a first communication device;
• a second communication device configured to communicate with the first communication device through a communication path ensuring a first security;
• and
• a third communication device configured to communicate with the first communication device at a second security which is lower than the first security,
• wherein the first communication device includes:
• a data receiving unit configured to receive data from the second communication device;
• a security level setting unit configured to set a security level, in the communication path, to the data when the data is received from the data receiving unit;
• a security level determining unit configured to determine a necessary security level that is necessary for transmitting the data, in accordance with the security level set by the security level setting unit;
• a security level setting unit that sets the necessary security level to the data;
• and
• a security procedure applying unit that applies a security procedure satisfying a requirement of the security level set by the security level setting unit to the data;
• and
• a data transmitting unit that transmits the data to which the security procedure has been applied to the third communication device.

A computer program product for a communication device that transmits data to another communication device through a network, the computer program product comprising a computer readable instructions that cause a computer to:

• determine a necessary security level to transmit the data in accordance with the security level set to the data;
• re-set the security level that is determined by the security level determining unit to the data;
• apply a security procedure to the data so that a requirement of the security level set by the security setting unit is satisfied;
• and
• transmit the data to which the security procedure has been applied.