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X-ASVP Executive Overview

X-ASVP Executive Overview. eXtensible Anti-spam Verification Protocol. X-ASVP Committee Technical Working Group July 25, 2007. Agenda. Uses for X-ASVP How X-ASVP works X-ASVP Process flow URL “search path” algorithm Meta-document example Implementation Overhead. Uses for X-ASVP.

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X-ASVP Executive Overview

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  1. X-ASVP Executive Overview eXtensible Anti-spam Verification Protocol X-ASVP Committee Technical Working Group July 25, 2007

  2. Agenda • Uses for X-ASVP • How X-ASVP works • X-ASVP Process flow • URL “search path” algorithm • Meta-document example • Implementation Overhead

  3. Uses for X-ASVP • Distributed Do Not E-mail Registry • Indicate “opt-out” as defined in CAN-SPAM Act • Would give ISP’s new legal standing and toolset to pursue spammers • Public Key Infrastructure • Would be a common location to post public keys • Authentication token (Level 1: ASVP-WEB) • Could be used to enforce authentication to a web server prior to accepting e-mail

  4. How X-ASVP works • Defines a set of web addresses associated to an e-mail address • One at the domain of the e-mail address • One at the host “www.x-asvp” in the same top level domain (.com, .net, .org, etc. ) as the e-mail address • One at the protocol committee’s website www.x-asvp.info • Defines syntax for posting user information at one (or more) of the above web addresses.

  5. X-ASVP Process Flow • Recipient posts an X-ASVP “meta-document” • E-mail sender collects recipient preferences from the posted meta-document • Bulk mail ( “legal” senders will respect UCE setting; those who don’t violate CAN-SPAM ) • PGP ( public key available on meta-document ) • ASVP-WEB ( “token” included in mail header )

  6. X-ASVP URL Algorithm • Goals: Distributed, Redundant, Universal • Hosts: 1. the domain, 2. top level domain, 3. global • Rules: 1. All alpha converted to uppercase, 2. non-alpha numeric converted to underscore • Example: John.Public1@foo.com • http://x-asvp.foo.com/FOO_COM/JOHN_PUBLIC1.HTM • http://www.x-asvp.com/FOO_COM/JOHN_PUBLIC1.HTM • http://www.x-asvp.info/COM/FOO_COM/JOHN_PUBLIC1.HTM

  7. Meta-document example Token for Level 1 “ASVP-WEB” extension Do Not E-mail “Registration” Asymmetric encryption public key

  8. Solution Data Flow

  9. Implementation Overhead • For an ISP or Enterprise that already runs a web server, implementation can be trivial • DNS record (CNAME) for “x-asvp” host • Virtual Host on existing web server • Generic page script (example on x-asvp.org ) • http://x-asvp.org/_pub/draft/HOWTO/

  10. Benefit of “trivial” implementation • Equivalent to posting “No Trespassing” on your Inbox. • If recognized as equivalent to listing in “National Do Not E-mail Registry”, then enforcement provisions of CAN-SPAM apply. • Spammers don’t know whether or not you’re filtering on the ASVP-WEB token provided. • New anti-spam toolset • IP address trail available when tokens are collected. • CGI script logic easier to implement (for token generation) than sender host verification at MTA.

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