1. A device comprising:
a memory being used to store a host identification key (IDKey), a host constant (HC), and a first key (HKey), the first key (HKey) being generated based on the host constant (HC);
a generator configured to decrypt encrypted secret identification information (E-SecretID) read from the external device by using information generated with the host identification key (IDKey) to generate a secret identification information (SecretID);
a third generator configured to generate a random number (RN);
a fourth generator configured to generate a session key (SKey) by using the first key (HKey) and the random number (RN);
a fifth generator configured to generate a first authentication information (Oneway-ID) by processing the secret identification information (SecretID) with the session key (SKey) in one-way function operation; and
a verification unit configured to determine whether the first authentication information (Oneway-ID) and a second authentication information (Oneway-ID) match, the second authentication information (Oneway-ID) being generated by the external device with the host constant (HC) transmitted to the external device.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A punch press tool comprising:
a cylindrical punch guide;
a punch body fit slidably into said punch guide; and
a punch tip comprising at least one forming punch tip detachably and exchangeably attached to said punch body and at least one clamping punch tip detachably and exchangeably attached to said punch body,
wherein said at least one forming punch tip each includes a press forming portion in a leading end;
wherein a length of each of said at least one clamping punch tip is shorter than a length of each of said at least one forming punch tip;
wherein at least one of said at least one forming punch tip and said at least one clamping punch tip comprises a plurality of punch tips;
wherein said punch guide is provided with a stripper in a leading end thereof, said stripper including a guide hole that receives and guides said at least one forming punch tip and said at least one clamping punch tip, and
wherein said stripper is provided with a projected portion that clamps a workpiece in a position adjacent to said guide hole.
2. A punch press tool according to claim 1, further comprising:
a die base;
a die body supported on said die base; and
a die tip held in said die body and comprising at least one forming die tip detachably and exchangeably attached to said die body and at least one sub die tip detachably and exchangeably attached to said die body,
wherein said at least one forming die tip each includes a forming portion in a leading end thereof, and
wherein a size of each of said at least one sub die tip is smaller than a size of each of said at least one forming die tip.
3. The punch press tool according to claim 2,
wherein at least one of said at least one forming die tip and said at least one of said sub die tip comprises a plurality of die tips.
4. A punch press tool, comprising:
a punch holder for a punch press;
a sliding body supported slidably within said punch holder; and
a punch tip that performs press forming, said punch tip being provided in a leading end of said sliding body and comprising at least one forming punch tip detachably and exchangeably attached to said sliding body and at least one clamping punch tip detachably and exchangeably attached to said sliding body,
wherein each of said at least one forming punch tip includes a press forming portion in a leading end thereof;
wherein a length of each of said at least one clamping punch tip is shorter than a length of each of said at least one forming punch tip;
wherein said punch holder is provided with a stripper in a leading end thereof, said stripper including a guide hole that receives and guides said at least one forming punch tip and said at least one clamping punch tip, and
wherein said stripper is provided with a projected portion that clamps a workpiece in a position adjacent to said guide hole.
5. The punch press tool according to claim 4,
wherein at least one of said at least one forming punch tip and said at least one clamping punch tip comprises a plurality of punch tips.