One of the systems which deliver the key which is used in encoding the data safely. Hideki the Yokohama National University Matsumoto working hard person and Imai of the University of Tokyo made theory, the advance corporation converted to algorithm. Encoding algorithm uses DES. The person who would like to encode has issuing secret ID first at KPS center, this the communications network without using, you acquire. It forms the common key cryptographic key in the release ID of this ID and mail address etc, of the receiving believer encodes the document with this key and transmits to the partner. The receiving believer forms the key in release ID of his own secret ID and the transmission person, it is possible to decode.

At one of bands of radio communication, the band 12 - 18GHz. It is used with satellite communications

Because the ground it is higher than the band which is used widely, fear of cross of communication between the ground is little. In addition, fluctuation of the reception level with the ionosphere and the atmosphere is little. The Ku band from the Ka band the rainfall and the like it is widely used in communication of the bulk to which attenuation and loss of the strength with the weather are small, wide band utilize.

KVM

Reading: K buoy m
Full spelling: K Virtual Machine
Field:
Programming > Java > KVM

With the component which becomes the nucleus of J2ME, it was developed the fact that extremely Java is operated with memory of small capacity and 128K as purpose.

The portable telephone and beeper, use by the portable information terminal, the set top box and the POS terminal and the like is supposed.

Approximately, the quite small size, 40KB is designated as merit, but in the functional aspect it is inferior somewhat e.g., the Java applet and real time function are not mounted in comparison with the other Java hypothetical machine.