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DKIM authentication basics Reputation layer above signature layer A modest publishing proposal   >Reputation  Using IP vs. Domain  IP Pros Can be at SMTP time Lots of existing practice High granularity Cons Dynamic Not portable Shared among senders Tied to machine, not org.n?D?D   Domain Names Pros Aligns better with org Long-term stability Less long-term admin Can be delegated Cons Must wait for message header to be transmitted More complex softwaren QE QE   Mistrust and Trust are DifferentMistrust Actor is typically hidden and unaccountable Look for bad behavior Heuristic results  with false positives Trust Actor is accountable and collaborative Presumes good intent Problems are  errors , not abuseL k] k]B   Trust is a separate channel  FDKIM  Identify a Responsible Party$ Goals Compatible/transparent with existing infrastructure Minimal new infrastructure Implemented independently of MUA clients Deployed incrementally Permit delegation of signing to third parties (non-authors)2  Non-Goals No assertions about behaviors of signing identity Not directions to receivers No protection after signature verification. No re-play protection Transit intermediary or a recipient can re-post the messageJ ZZ<Z <  >DKIM Core Technology  RFC 4871  $Authenticated identity DKIM-specific parameter From:, Sender:, intermediary, mailing list, other& Authentication mechanism Cryptographic signing Signer chooses header fields to include [+ body] DNS query mechanism Identity + selector defines query string Produces public keyZKZZGZZ=ZKG=   Effort to add to origination Private key Signing module Effort to add to reception Public key Validation module Limitations Minimal robustness against mailing lists Relaying can break signatureZZZZ ZFZ F   Sample DKIM Signed Message Received: from mercury.example.net (HELO mercury.example.net) ([192.168.1.1]) by mail.example.com with ESMTP/TLS/DHE-RSA-AES256-SHA; 01 Oct 2008 17:11:15 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=example.net; s=dorrington; t=1222881075; bh=HOVyUZdDUFeesnM3UIalZgPhdeJQS6N061IKw 7iUjZ4=; h=Message-ID:Date:From:MIME-Version:To:Subject: Content-Type:Content-Transfer-Encoding; b=kp3vRZo7CiYpOz8lQtlOTZ+W Gl+Cd+te3KPLzFVopncaLnmfyNE0XToxOqSo9FZFz7an9B25gxfjZpZ80LpXmaZmtxx tikwSp0gdDJOWHUtGD2zs1osjDbRKT6KyNYb7 Message-ID: <48E3AF2E.10108@example.net> Date: Wed, 01 Oct 2008 10:11:10 -0700 From: Alice Smith MIME-Version: 1.0 To: Bob Brown Subject: Tomorrow's meeting Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Authentication-Results: mail.example.com; header.From=alice@example.net; dkim=pass ( sig from example.net/dorrington verified; ); Bob, X0ZB  2           z  d           Status dkim.org/#deployment 20(!) at interop event 18 software; 5 service Steady adoption rate Relatively minor early-stage rough edges Some confusion about identity to evaluate  DKIM has two identity parameters (d= and I=)LD)XD)XF      !!0 NFurther work ADSP  publish signing practices to detect messages that should be signed Authentication-Results  header from signature validator to identity assessor & &  *     4Authentication is Useless&  & by itself We all say this, but do we appreciate what it really means? We often say: If you have a validated name, you can make simple decisions for folks you know. After all, you already know that I m a great guy& But this means really means you ve gone beyond simple authentication& into reputation. This added layer is a barrier to adoption of authentication! Must have a reputation step, before an adopter gets value. Potential adopters of authentication are waiting for compelling and immediate utility that is turnkey. Z<0_#^0ZK0_#=0ZK0_# <O=;  V        Can a simple project help? Some utility, based on authentication Without prior sender/receiver arrangement Goals Simple, useful Not compete with  reputation services& Possibly serve as a template for others Proposal Published Member List (PML)~&*` &*`     Published Member List (PML) Pilot project Create an email trust domain among member institutions to permit streamlined email filter handling. Demonstrate utility of validated membership lists Publish a list of a group s members Membership can be a meaningful  indication of Goodness Might publish related attributes, like type of institution Assessor might interpret favorably, but not give message a free pass Could be template for other organizations Banks, Airlines, Governments, Political Parties& $*1$ *1    Project Details Write charter for project Define expected use by assessment engine Agree on list semantics Evaluate legal implications Document and publish it  Obtain agreements to publish Define DNS/VBR* query format Begin operation Document the project Recruit spamassassin and other users of list  Attributes in an Entry Domain name Associated name of institution Member attributes, such as Type of institution & ?&FF] Audience Survey NInterest? 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