Add-on dossier

Printed liner and audio puzzle

A linkable lifecycle record for hardware expansions, app ecosystems, firmware upgrades, cases, radio parts, and post-event badge experiments.

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media challenge

Folded liner notes and the cassette audio carried track-list, color, character, tone, and number-station-style clues for remote badge solving.

Badge
DEF CON 28 Safe Mode Badge
Type
media challenge
Status
historical
Compatibility
DEF CON 28 Safe Mode Badge
Source
https://astralvx.com/def-con-28-badge-challenges/

Badge context

Related Resources

Source trail

Evidence Sources

DEF CON archive mirror · retrieved 2026-05-15

DEF CON 28 Safe Mode archive

Event archive source for Safe Mode cancellation/online-event context, Human Plus support framing, and the official announcement that the badge was a LosT-created cassette tape.

Badge: DEF CON 28 Safe Mode Badge