This circuit-breaker has at least one arcing chamber which is filled with isolating gas, extends along a longitudinal axis, is designed to be essentially radially symmetrical, contains an arc area and has at least two power contact pieces. Transmission side transmits processed data, second signed data obtained by applying one-way function to merged data of the processed data and first signed data of an original image and ciphering the output of the one-way function with transmission side secret key, and ciphered signed data obtained by ciphering the first signed data with reception side private key. With the workpiece rotatably supported on a parallel distant second axis, the rolling die is advanced in an in-feed direction to meshingly engage with the workpiece.