DEF CON 23 · United States · 2015

DEF CON 23 Badge

Playable vinyl-record noir puzzle badge

A Ryan Clarke / 1o57-designed DEF CON 23 badge issued as an actual playable 7-inch vinyl record, with role-colored editions, printed mystery alphabets, inner-groove markings, lanyard ciphers, record audio, and a noir-themed badge challenge.

DEF CON United States Vinyl Record Analog Badge Cryptography Lanyard Cipher Badge Contest Ryan Clarke North America

EventDEF CON 23

SeriesDEF CON

LocationParis Hotel and Bally's Hotel, Las Vegas, Nevada

CountryUnited States

Image Provenance

Asset: optimized WebP crop from licensed documentary video frame
Status: licensed original video-frame derivative
Source: DT and 1057 - Welcome to DEF CON
License: Creative Commons Attribution 3.0 Unported
Attribution: Jeff Moss / The Dark Tangent, Ryan Clarke / 1o57, DEF CON, via TIB AV-Portal
Notes: Original 1280x720 frame extracted at 00:09:56 from the CC BY 3.0 TIB AV-Portal recording of the DEF CON 23 opening and badge talk and preserved in Public/images/source. The public WebP asset is a metadata-stripped crop limited to the talk-slide collage of real DEF CON 23 vinyl record badge role variants; it is not generated content, a placeholder, an article image, an attendee scrape, or an uncleared social-media photo. The published badge.gallery delivery file is an optimized WebP generated from the rights-cleared local derivative/source with metadata stripped, WebP quality 82, and a maximum side cap of 1600 pixels when the source is larger; upstream source URL, license, and attribution remain unchanged.

People

Authors & Credits

CC BY licensed talk video host

TIB AV-Portal

TIB AV-Portal publishes the DEF CON 23 opening and badge talk with CC BY 3.0 license metadata; the catalogue uses a timestamped frame as image provenance.

Source

Hackaday badge report author

Mike Szczys

Author of the Hackaday source documenting the DEF CON 23 vinyl-record badge and collaborative deciphering effort.

Source

The Register field reporter

Iain Thomson

The Register article is based on Iain Thomson's DEF CON 23 attendee record-badge observations.

Source

badge challenge writeup

Team Potato / Elegin writeup team

The public writeup documents the lanyard ciphers, clue trail, and solved badge-challenge flow.

Source

badge designer and puzzle author

Ryan Clarke / LostboY / 1o57

The Register identifies LostboY / 1o57 / Ryan Clarke as the DEF CON 23 badge brain and creator.

Source

Why It Mattered

It is one of DEF CON's clearest analog badge turns: the official admission artifact stayed hackable without a microcontroller by making audio playback, physical inspection, enciphered lanyards, printed ephemera, and social clue sharing part of the game.

Hardware

Public reports describe a playable 7-inch vinyl record badge rather than powered electronics. Role versions used different colors and writing, and the artifact carried printed line art, secret alphabet text, scratched inner-groove messages, lanyard material, and record tracks as clue surfaces.

Software & Apps

No badge firmware is claimed. The solvable surfaces were analog and archival: vinyl audio, lanyard Nyctograph and Gold-Bug-style ciphers, printed numbers, role-specific badge text, key cards, and public challenge-writeup material.

Lore

The badge leaned into DEF CON 23's noir mood and the long-running 1o57 puzzle arc. Contemporary coverage framed it as a surprising fully analog follow-up to electronic badge years, while later puzzle analysis used DEF CON 23 as a canonical badge-challenge example.

Lifecycle

Add-ons & Upgrades

analog challenge historical

Playable record clue surface

The official badge was a playable vinyl record, making audio playback and record inspection part of the badge-hacking surface instead of firmware or active electronics.

Compatibility: DEF CON 23 Badge

Source

cipher material historical

Nyctograph and Gold Bug lanyards

The badge challenge used six lanyards carrying Lewis Carroll Nyctograph symbols and Poe Gold Bug cipher material that translated into early-stage secret messages.

Compatibility: DEF CON 23 Badge

Source

event puzzle historical

Noir key-card trail

Public writeups and attendee recaps describe DEF CON 23 key-card material as part of the noir-themed badge challenge trail.

Compatibility: DEF CON 23 Badge

Source

Operational history

Issues & Camp Impact

analog scope note

DEF CON 23's official badge is documented as a fully analog playable record rather than an electronic board.

The compendium avoids MCU, firmware, LED, battery, and circuit claims and records the audio, physical, lanyard, and printed clue surfaces instead.

Confidence: source-backed
Status: documented
Timeframe: DEF CON 23 badge pass
Source note: Hackaday, The Register, and DEF CON 23 challenge writeups.

image provenance note

The DEF CON 23 image uses a 00:09:56 frame from the CC BY 3.0 TIB AV-Portal / DEF CON recording `DT and 1057 - Welcome to DEF CON`, cropped to the talk-slide collage of real vinyl record badge variants.

The entry now has a rights-cleared documentary video-frame derivative while continuing to avoid The Register, Hackaday, writeup, attendee, social-media, generated, and placeholder imagery.

Confidence: source-backed
Status: licensed video-frame replacement applied
Timeframe: 2026 image replacement pass
Source note: TIB AV-Portal media 36360 license metadata and badge.gallery image policy.

Resources

DEF CON 23 event archive event page · Official DEF CON archive source for 2015 event context, conference material links, contest framing, and post-event archive records. DEF CON 23 record badge article article · Contemporary article documenting LostboY / Ryan Clarke authorship, playable vinyl record format, role-color variants, secret alphabets, inner-groove markings, and analog puzzle clues. DEFCON 23 Badge Challenge writeup writeup · Public challenge writeup documenting six lanyards, Nyctograph and Gold Bug cipher use, badge text, lanyard translations, key cards, and solution flow. DT and 1057 - Welcome to DEF CON licensed talk video · TIB AV-Portal recording with CC BY 3.0 license metadata, DEF CON publisher metadata, and a badge-talk slide showing the DEF CON 23 vinyl record badge variants at 00:09:56. Decrypting DEF CON badge challenges article · Later puzzle-analysis source using DEF CON 23 as an example of lanyard-based Nyctograph and Gold Bug enciphered secret messages. Help Decipher The DEFCON Badge article · Contemporary Hackaday source documenting the 7-inch vinyl record badge, non-electronic alternation context, collaborative badge-hacking effort, and early puzzle hunt.

Sources

DEF CON: DEF CON 23 Hacking Conference Retrieved 2026-05-15 · Official event archive source for DEF CON 23 context, conference materials, contest links, and post-event archive records. Elegin / Team Potato: Defcon 23 Badge Challenge Retrieved 2026-05-15 · Challenge writeup source for lanyard ciphers, Nyctograph and Gold Bug alphabets, lanyard translations, key-card clues, and solution flow. Hackaday: Help Decipher The DEFCON Badge Retrieved 2026-05-15 · Contemporary source for 7-inch vinyl record badge format, non-electronic badge-year framing, and collaborative badge-hacking context. Help Net Security: Decrypting DEF CON badge challenges Retrieved 2026-05-15 · Later secondary source for DEF CON 23's six lanyards and Nyctograph / Gold Bug enciphered-message role in the badge challenge. TIB AV-Portal / DEF CON: DT and 1057 - Welcome to DEF CON Retrieved 2026-05-15 · CC BY 3.0 licensed video source for the DEF CON 23 opening and badge talk; a 00:09:56 frame is used only for image provenance after cropping to the talk-slide vinyl record badge collage. The Register: Is this the most puzzling DEF CON attendee badge yet on record? Retrieved 2026-05-15 · Contemporary source for LostboY / Ryan Clarke authorship, playable vinyl record format, role-color variants, secret alphabet text, inner-groove markings, and analog puzzle surface.