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The root certification authorities are defined ultimately and built into the software key stores. However, an end-user is not given any criteria to distinguish the built-in root CAs; hence he is unable to manage the default key store effectively. In this thesis, a new approach of creating a reputation score for the trusted third parties (TTPs) is proposed. Each TTP is evaluated using its financial performance. The amount of transaction fees put on the certificate-signing transactions is counted and used as the reputation score instead of peer feedbacks. It becomes more expensive for a potential attacker to perform Sybil attack due to the increased cost of the vote. The verification experiments showed that even if the feedback-based reputation score is replaced with the financial reputation score, the peer distribution will still follow the power law distribution, and thus the trust decision algorithms based on power law are applicable. Flatcoin, the practical implementation of the proposed reputation system is also described. It expands the Namecoin protocol with certificate payment transactions. The distributed timestamping approach used in Flatcoin provides domain name registration and paid certificate-signing requests in a completely distributed manner. Flatcoin effectively replaces DNS, DNSSEC and SSL Extended Validation without any single pretrusted certificate delivered with the client software.", "subitem_description_type": "Abstract"}]}, "item_7_full_name_3": {"attribute_name": "\u8457\u8005\u5225\u540d", "attribute_value_mlt": [{"nameIdentifiers": [{"nameIdentifier": "10600", "nameIdentifierScheme": "WEKO"}], "names": [{"name": "\u30f4\u30a3\u30b7\u30a7\u30b4\u30ed\u30c7\u30c4\u30a7\u30d5, \u30de\u30e9\u30c3\u30c8"}]}]}, "item_7_select_21": {"attribute_name": "\u5b66\u4f4d", "attribute_value_mlt": [{"subitem_select_item": "master"}]}, "item_7_text_24": {"attribute_name": "\u7814\u7a76\u79d1\u30fb\u5c02\u653b", "attribute_value_mlt": [{"subitem_text_value": "\u5de5\u5b66\u7cfb\u7814\u7a76\u79d1\u30fb\u96fb\u6c17\u7cfb\u5de5\u5b66\u5c02\u653b"}]}, "item_7_text_36": {"attribute_name": "\u8cc7\u6e90\u30bf\u30a4\u30d7", "attribute_value_mlt": [{"subitem_text_value": "Thesis"}]}, "item_7_text_4": {"attribute_name": "\u8457\u8005\u6240\u5c5e", "attribute_value_mlt": [{"subitem_text_value": "\u6771\u4eac\u5927\u5b66\u5927\u5b66\u9662\u5de5\u5b66\u7cfb\u7814\u7a76\u79d1\u96fb\u6c17\u7cfb\u5de5\u5b66\u5c02\u653b"}, {"subitem_text_value": "Department of Electrical Engineering and Information Systems, Graduate School of Engineering, The University of Tokyo"}]}, "item_creator": {"attribute_name": "\u8457\u8005", "attribute_type": "creator", "attribute_value_mlt": [{"creatorNames": [{"creatorName": "Vyshegorodtsev, Marat"}], "nameIdentifiers": [{"nameIdentifier": "10599", "nameIdentifierScheme": "WEKO"}]}]}, "item_files": {"attribute_name": "\u30d5\u30a1\u30a4\u30eb\u60c5\u5831", "attribute_type": "file", "attribute_value_mlt": [{"accessrole": "open_date", "date": [{"dateType": "Available", "dateValue": "2017-06-01"}], "displaytype": "detail", "download_preview_message": "", "file_order": 0, "filename": "37116886.pdf", "filesize": [{"value": "5.1 MB"}], "format": "application/pdf", "future_date_message": "", "is_thumbnail": false, "licensetype": "license_free", "mimetype": "application/pdf", "size": 5100000.0, "url": {"label": "37116886.pdf", "url": "https://repository.dl.itc.u-tokyo.ac.jp/record/4886/files/37116886.pdf"}, "version_id": "c4de0ec4-3d99-47f0-a51c-f657fc5159af"}]}, "item_language": {"attribute_name": "\u8a00\u8a9e", "attribute_value_mlt": [{"subitem_language": "eng"}]}, "item_resource_type": {"attribute_name": "\u8cc7\u6e90\u30bf\u30a4\u30d7", "attribute_value_mlt": [{"resourcetype": "thesis", "resourceuri": "http://purl.org/coar/resource_type/c_46ec"}]}, "item_title": "Proposal of a new trust model for the Internet peers using a financial reputation score", "item_titles": {"attribute_name": "\u30bf\u30a4\u30c8\u30eb", "attribute_value_mlt": [{"subitem_title": "Proposal of a new trust model for the Internet peers using a financial reputation score"}]}, "item_type_id": "7", "owner": "1", "path": ["9/233/234", "6/209/271"], "permalink_uri": "http://hdl.handle.net/2261/54231", "pubdate": {"attribute_name": "\u516c\u958b\u65e5", "attribute_name_i18n": "\u516c\u958b\u65e5", "attribute_value": "2013-05-07"}, "publish_date": "2013-05-07", "publish_status": "0", "recid": "4886", "relation": {}, "relation_version_is_last": true, "title": ["Proposal of a new trust model for the Internet peers using a financial reputation score"], "weko_shared_id": null}