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Chung-Kwei:

  • Teiresias is IBM's pattern-discovery tool from bioinformatics
  • looks *directly* transferrable to SpamAssassin's "regexp rules" approach
  • probably heavily patented and hard to license though
  • but a Google search for "pattern discovery algorithm" looks like a promising source (wink)

Social network talk:

  • pretty useless; not any spam orientation at all

Joshua Goodman Received talk:

  • talking about parsing Received lines
  • basically reimplementing spamcop algorithm
  • looking for "last external IP address"
  • thinks this will be useful for SenderID
  • SenderID example uses HELO data, looks like, instead of PRA or SMTP MAIL FROM; due to multiple intervening hops
  • try to use heuristics to find last external IP address:
    • using MX data fails due to load-balancing edge router
    • also the msn.com/hotmail.com problem
  • proposed algo:
    • IP addr is 192.168
    • HELO matches user's domain and forward DNS lookup of HELO matches IP address
    • find an IP that matches MX record, next is external
  • Bob Atk suggested putting external IP addrs in a DNS record?!

Brett Watson: beyond identity: problems even with sender id

  • economics of whitelisting/blacklisting based on a reliable sender identification (ie. forging is no longer possible)
  • mostly a philsophical talk

Multiple email addresses:

  • about 50% of surveyed users had multiple email addresses
  • "identities"; separation of work, personal, social groups; pseudo-anonymity; affiliation, status, prestige (alumni accts)
  • mobility (available on the road)
  • people now frequently have different "role" accounts
  • typically once people go over 3 accts, they set them up to forward to a smaller number
  • 20-30% of all email addrs change annually
  • this talk is really oriented towards MUA UI developers
  • another talk with not a whole lot of antispam relevance (sad)

Panel discussion of monetary spam filtering:

  • Cynthia Dwork's talk:
    • 16 seconds per message computation time doubles spam cost
    • 56 seconds per message " means $36 per message for spammers
    • cycle theft arguments (zombies are illegal; spyware can be combatted with user @+ education) *already don't work* in the real world
  • MailFrontier:
    • some kind of marketroid noise about how they're "third generation" because they have grey areas, or something; combination of multiple tests means "definitely spam, no false positives". riiight
    • "Reverse Turing Test": C-R as usual
    • except the C-R page has some kind of plugin which will burn CPU cycles instead, woo
  • The naysayer:
    • going rate to solve puzzles is about $.11/hr in South India
    • Real Money systems: people will regulate it; EU Directive on E-Money (2000/46/EC)
    • people will walk away with 2.5% of it (cost of running + greed)
    • people will steal it (e.g. sysadmin skimming x% of incoming mails and stealing their tokens)
    • Payment systems: settlement: see taugh.com
    • also compares with the telco system (~1200mill ham mails/day, ~2000mill phone calls per day) – much fewer calls on telco system, most local, diff trust model
    • how much payment:
      • 30 responses per mill: .1c/mail mean $33 per sale to be viable
      • if .05c/mail, $16
      • at a 0.7% response rate, $33 profit means 23c/mail
    • http://www.cl.cam.ac.uk/~rnc1/
  • questions:
    • to Ironport: "why can't I nominate a charity?" to avoid interested parties
    • Dan to Ironport: "how much bonds debited?" not very much
    • question from an Indian querier: "any documented cases of South Indian kids clicking on CAPTCHAs?" MailFrontier guy, naturally, says "nope". In reality, the answer is "yes", but that was in Thailand
    • Yahoo! guy on CAPTCHAs: "seen everything: porn sites, people paid to type them; sites in Russia with full pages of CAPTCHAs, 10 hour turnaround after a new fix is deployed"
    • Vanquish guy says they use CMU's CAPTCHA code
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