Patent ID: 8261055

Claim:
An information processing system comprising: a first information processing apparatus having an encryption function; and a second information processing apparatus having no encryption function, wherein the first information processing apparatus comprises: a first interface configured to communicate with an external device via a first network; a second interface configured to communicate with the second information processing apparatus via a second network; and a first controller configured to: encrypt each of a plurality of items of packet-data that are received from the second information processing apparatus via the second interface, wherein the plurality of items of packet-data are generated by the second information apparatus by segmenting data to be transmitted; attach data necessary for encryption communication to the encrypted plurality of items of packet-data and transmit the encrypted plurality of items of packet-data to which the data is attached to the external device via the first interface in a case that the first information processing apparatus performs an encryption communication; and transmit the plurality of items of packet-data received via the second interface to the external device via the first interface without attaching the data necessary for the encryption communication in a case that the first information processing apparatus does not perform the encryption communication, and wherein the second information processing apparatus comprises a second controller configured to: segment data to be transmitted into a plurality of items of packet-data in accordance with a data size defined by subtracting a data size of data necessary for the encryption communication from a specified data size in a case that the first information processing apparatus performs the encryption communication; segment the data to be transmitted into a plurality of items of packet-data, each having the specified data size in a case that the first information processing apparatus does not perform the encryption communication; and transmit each of the segmented plurality of items of packet-data to the first information processing apparatus.