Abstract: A key distribution control apparatus, a radio base station apparatus and a communication system for improving security. A communication system (10) comprises an Access controller (100), which serves as a key distribution control apparatus, a wireless LAN base station apparatus (200) and a communication terminal (300). The Access controller (100) performs an authentication of the communication terminal (300), and the wireless LAN base station apparatus (200) performs a decryption process in the communication with the communication terminal (300). A standard of 802.11i or WPA, which is specified on the precondition that the same device performs the authentication and the decryption process, is applied to the communication system (10). In this way, a wireless communication system that improves the security can be realized.

Abstract: A key distribution control apparatus, a radio base station apparatus and a communication system for improving security. A communication system (10) comprises an Access controller (100), which serves as a key distribution control apparatus, a wireless LAN base station apparatus (200) and a communication terminal (300). The Access controller (100) performs an authentication of the communication terminal (300), and the wireless LAN base station apparatus (200) performs a decryption process in the communication with the communication terminal (300). A standard of 802.11i or WPA, which is specified on the precondition that the same device performs the authentication and the decryption process, is applied to the communication system (10). In this way, a wireless communication system that improves the security can be realized.

Abstract: A developing device for developing an electrostatic latent image formed on an image carrier includes a roller which carries toner particles to the developing position and a porous foam member of a material such as urethane resin which contacts the roller. The porous foam member comes in contact with either a developing roller or a toner supply roller which supplies toner particles to the developing roller. Toner particles supported in the holes of the porous foam member are charged as the particles rub against the developing roller or toner supply roller, causing the particles to be readily transferred to the roller. The porous foam member causes the amount of toner particles supported on the surface of the developing roller or the toner-supply roller to be sufficient to prevent a reduction in the density of the toner image even directly after a larger amount of toner particles are consumed for developing a solid toner region for example.