Abstract: Method and system for authenticating a remote device are disclosed by an arrangement in which the remote device and an authentication center each contain an identical key code index, which includes a plurality of key code numbers. When a remote device identifies itself to the authentication center by sending identification information, the authentication center generates a first key using a portion of the received identification information and a first random number that specifies a first key code number. The remote device determines the first key code number from the first key. If the remote device recognizes the first key code number from among the stored plurality of key code numbers, the remote device generates a second key, which includes a second random number that specifies a second key code number, and a portion of the identification information. From the second key, the authentication center determines a second key code number.

Abstract: An electric coffee maker comprises a material grinding compartment (24) having a cutter (23) adapted to be drivingly rotated by a driving motor (22) provided in a coffee maker body (37); a filtering compartment (25) provided side by side with and communicated with the material grinding compartment (24); a tank (42) for containing water; a heater section (39) for heating water supplied from the tank (42); and a change-over device (64) for performing a change-over action such that water having been heated by the heater section (39) is circulated through the tank (42) or supplied to the filtering compartment (25).