DEF CON

DEF CON 23

The 2015 DEF CON edition whose official Ryan Clarke / 1o57 badge went fully analog as a playable 7-inch vinyl record with lanyard ciphers, groove clues, role colors, audio clues, and a noir badge challenge.

Paris Hotel and Bally's Hotel, Las Vegas, Nevada · United States · 2015

DEF CON 23 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.

Lifecycle

Add-ons & Upgrades

DEF CON 23 Badge historical

analog challenge

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

DEF CON 23 Badge historical

cipher material

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

DEF CON 23 Badge historical

event puzzle

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

Operational history

Issues & Camp Impact

DEF CON 23 Badge note

analog scope · source-backed · documented

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.

DEF CON 23 Badge note

image provenance · source-backed · licensed video-frame replacement applied

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.

Resources

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. 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. 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. 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. 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.

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.