Information processing system and information processing method capable of communicating with impermissible protocol

An information processing system comprising a transmission-sided information processing apparatus and a reception-sided information processing apparatus connected via a protocol pass-preventing device, wherein said transmission-sided information includes:

• an impermissible protocol forming section for forming an impermissible protocol which cannot pass through said protocol pass-preventing device;
• a data processing section for processing data of said impermissible protocol;
• a writing section for writing either the impermissible protocol or said data-processed impermissible protocol in a data area of such a permissible protocol which can pass through said protocol pass-preventing device;
• and
• a transmission section for transmitting the permissible protocol;
• and wherein
• said reception-sided information processing apparatus includes:
• a reception section for receiving said permissible protocol;
• an extraction section for extracting either said impermissible protocol or said data-processed impermissible protocol from the permissible protocol;
• a restore section for restoring the data-processed impermissible protocol;
• an execution section for executing either said extracted impermissible protocol or said restored impermissible protocol in accordance with the procedure of the impermissible protocol;
• a first judgment section for judging as to whether or not said impermissible protocol is present in the permissible protocol;
• a first investigation section for investigating as to whether or not how said impermissible protocol has been written in the permissible protocol;
• a second judgment section for judging as to whether or not said impermissible protocol contained in the permissible protocol has been data-processed;
• and
• a second investigation section for investigating as to how said impermissible protocol contained in the permissible protocol has been data-processed.

An information processing method executed in an information processing system comprising a transmission-sided information processing apparatus and a reception-sided information processing apparatus connected via a protocol pass-preventing device such as a firewall, said information processing method comprising the steps of:

• forming an impermissible protocol corresponding to a protocol which cannot pass through said protocol pass-preventing device;
• processing data of said impermissible protocol;
• writing either said impermissible protocol or said data-processed impermissible protocol in a data area of such a permissible protocol which can pass through said protocol pass-preventing device;
• transmitting said permissible protocol;
• receiving said permissible protocol;
• extracting either said impermissible protocol or said data-processed impermissible protocol from the permissible protocol;
• restoring said data-processed impermissible protocol;
• executing either said extracted impermissible protocol or said restored impermissible protocol in accordance with the procedure of said impermissible protocol;
• previously judging as to whether or not said impermissible protocol is present in said permissible protocol;
• previously investigating as to whether or not said impermissible protocol has been written in the permissible protocol;
• previously judging as to whether or not said impermissible protocol contained in the permissible protocol has been data-processed;
• and
• previously investigating as to how said impermissible protocol contained in the permissible protocol has been data-processed.

An information processing system comprising:

• a protocol pass-preventing device for causing only a predetermined protocol to pass to and from an external data transmission line;
• a transmission section for transmitting data to the external data transmission line through said protocol pass-preventing device, said transmission section including a writing section for writing a protocol which cannot pass through said protocol pass-preventing device in a data area of a protocol which can pass through said protocol pass-preventing device;
• and
• a reception section including extraction section provided for extracting said protocol which cannot pass through said protocol pass-preventing device from said data area of the protocol data which can pass through said protocol pass-preventing device, wherein
• said reception section has a judgment section for judging as to whether or not a protocol which cannot pass through said protocol pass-preventing device is present in a data area of a protocol which can pass through said protocol pass-preventing device.