I-D Action:draft-otis-dkim-tpa-label-03.txt
Internet-Drafts@ietf.org Tue, 20 October 2009 23:30 UTC
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A New Internet-Draft is available from the on-line Internet-Drafts directories. Title : DKIM Third-Party Authorization Label Author(s) : D. Otis, D. Black Filename : draft-otis-dkim-tpa-label-03.txt Pages : 28 Date : 2009-10-20 A third party authorization label (TPA-Label) is a DNS-based prefix for DKIM ADSP records that acts as a scheme for domains to authorize acceptable third-party signatures for messages containing their domain within the From header. This scheme allows Author Domains to autonomously authorize a range of third-party domains using scalable, individual DNS transactions. This authorization extends the scope of DKIM signing practice assertions as a means to supplant more difficult to administer schemes. Alternatives for facilitating third-party authorizations currently necessitate the coordination between two or more domains to synchronously set up selector/key DNS records, DNS zone delegations, and/or the regular exchange of public/ private keys. Checking TPA-Label Resource Records for signing practices may occur when an Author Domain Signature is missing or is invalid and a Third Party Signature exists. When a third-party signature is found, TPA- Label Resource Record transactions offer an efficient means for Author Domains to authorize specific third-party signing domains and for recipients to determine whether an authorization exists. The TPA-Label Resource Record scheme reduces reliance upon email source reputation that is often based upon an IP address rather than the domain. A URL for this Internet-Draft is: http://www.ietf.org/internet-drafts/draft-otis-dkim-tpa-label-03.txt Internet-Drafts are also available by anonymous FTP at: ftp://ftp.ietf.org/internet-drafts/ Below is the data which will enable a MIME compliant mail reader implementation to automatically retrieve the ASCII version of the Internet-Draft.
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