A method of hashing biometric data for generation of a public template is disclosed. The information applied to a packet may be \u201ccontext information\u201d which replaces at least some bits of layer 2 information. Such qualifications could include expertise in specific factors. A vibration motor is fixed to the main body, which when operated imparts vibrations to the substantial contact areas via the main body to enable the device to perform a massage that simulates a hand massage. Accordingly, during sulfur purging control by the NOx occlusion reduction type catalyst, consideration is given to the discharge of NOx without sulfur purging at the start of sulfur purging control; furthermore, this timing is judged by monitoring the concentration of oxygen downstream of the NOx occlusion reduction type catalyst, thus optimizing sulfur purging control.