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A digital identity is information used by computer systems to represent an external agent. That agent may be a person, organisation, or device. The information in digital identities is used by computers to make decisions about how to interact with external agents. It allows a computer to answer two basic questions: * With which external agent is it interacting? * Has it interacted with an external agent in the past? The information contained in a digital identity allows these questions to be answered without the involvement of human operators. Digital identities allow our access to computers and the services they provide to be automated, and make it possible for computers to mediate relationships. The term "digital identity" has also come to denote aspects of civil and personal identity that have resulted from the widespread use of identity information to represent people in computer systems. Digital identity is now often used in ways that require data about persons stored in computer systems to be linked to their civil, or national, identities. Furthermore, the use of digital identities is now so widespread that many discussions refer to "digital identity" as the entire collection of information generated by a person’s online activity. Especially where that information is publicly available, and can be used by others to discover that person's civil identity. In this wider sense, a digital identity is a version, or facet, of a person's social, identity. This may also referred to as an online identity. The legal and social effects of digital identity are complex and challenging. However, they are simply a consequence of the increasing use of computers, and the need to provide computers with information that can be used to identify external agents. ==Background== A critical problem in cyberspace is knowing with whom one is interacting. Currently there are no ways to precisely determine the identity of a person in digital space. Even though there are attributes associated to a person's digital identity, these attributes or even identities can be changed, masked or dumped and new ones created. Despite the fact that there are many authentication systems and digital identifiers that try to address these problems, there is still a need for a unified and verified identification system. Thus, there are issues of privacy and security related to digital identity. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Digital identity」の詳細全文を読む スポンサード リンク
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