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| E-mail authentication ： ウィキペディア英語版 |
Email authentication
Email authentication is a collection of techniques aimed at equipping messages of the email transport system with verifiable information. It is a coarse-grained authentication, usually at Administrative Management Domain (ADMD) level, and implies no sort of authorization. That is, the purpose of email authentication is to validate the identities of the parties who participated in transferring a message, as they can modify the message. The results of such validation can then be used in delivery decisions, which are beyond the scope of email authentication proper, and are quite different in nature from content filtering.
==Rationale==
Ensuring a ''valid identity'' on an email has become a vital step in stopping spam (as email can be filtered based on such an identity), forgery, fraud, and even more serious crimes. The Simple Mail Transfer Protocol (SMTP) is continuously evolving, but when it was designed, in the early 1980s, it was the purview of academia and government agencies, and as such, there was no cause to consider security. It provided for no real verification of sender.
Signing emails is a good first step towards identifying the origin of the message, but it does not establish whether that identity has a good reputation or whether it should be trusted.
This article explains how email identities are forged and the steps that are being taken now to prevent it.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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