---
id: "kerione-the-duplicity-game"
type: "talk"
type_label: "Talks and presentations"
title: "The Duplicity Game: or why you can trust KERI"
maintainer: "Samuel M. Smith, Ph.D."
authors:
  - "Samuel M. Smith, Ph.D."
date: "2020-04"
year: 2020
reading_level: "practitioner"
reading_level_label: "Practitioner"
reading_level_meaning: "architects, product people and adopters who know identity systems"
evidence: "informative"
evidence_meaning: "an author's paper, deck, tutorial or post explaining the suite"
status: "quiet"
status_meaning: "no change in six to eighteen months; still correct"
access: "public"
access_meaning: "anyone with the link"
topics:
  - "theory"
  - "infrastructure"
  - "events"
roles:
  - "security-architect"
  - "infrastructure-operator"
  - "communications"
  - "business-development"
  - "researcher"
source_url: "https://github.com/SmithSamuelM/Papers/blob/master/presentations/DuplicityGame_IIW_2020_A.pdf"
source_license: null
source_license_note: null
found_on: "keri-one-resources"
kerisse_credit: false
abstract_license: "CC BY 4.0"
abstract_license_url: "https://creativecommons.org/licenses/by/4.0/"
abstract_attribution: "KSKB, the KERISuite Knowledge Base (https://kskb.dev/)"
last_checked: "2026-10-14"
kskb_url: "https://kskb.dev/cards/kerione-the-duplicity-game/"
kskb_app_url: "https://kskb.dev/#item/kerione-the-duplicity-game"
kskb_record_url: "https://kskb.dev/data/kskb/resources/kerione-the-duplicity-game"
kskb_markdown_url: "https://kskb.dev/export/cards/kerione-the-duplicity-game.md"
---

# The Duplicity Game: or why you can trust KERI

A 72-slide deck presented at Internet Identity Workshop (IIW) Spring 2020 that steps through a game between a controller and validators to show how inconsistency and duplicity in key event logs can or cannot go undetected under local and global consistency guarantees. It closes on key event based provenance and certificate transparency, for readers who want the intuition behind KERI's duplicity detection.

Labels: reading level Practitioner; evidence informative (an author's paper, deck, tutorial or post explaining the suite).
Source: https://github.com/SmithSamuelM/Papers/blob/master/presentations/DuplicityGame_IIW_2020_A.pdf (license not recorded).
The abstract is KSKB's own text under Creative Commons Attribution 4.0 (CC BY 4.0), https://creativecommons.org/licenses/by/4.0/; credit KSKB, the KERISuite Knowledge Base (https://kskb.dev/).