| http://www.w3.org/ns/prov#value | - y it is impossible for a third party to alter the various kinds of information stored in the e-purse body C0, and so security is enhanced. [0294] [1-4-27] The valuable data attached to the e-purse body C0 is ciphered by an appointed public key, and a secret key corresponding to the public key is managed by at least one of the settlement service company 3 and a payee, whereby a person who can subst
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