| http://www.w3.org/ns/prov#value | - This key is stored in the authentication key memory 28 of the mobile terminal 28, in correspondence with the ID information of that device 2. [0124] In the case where the device 2 accesses the cellular phone network 6, the device 2 attaches a message authentication code based on a one-way hash function such as MD5, for example, by using this authentication key, to a message in a prescribed format,
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