Singapore

GreyBadge ECP5 firmware tree FPGA firmware · FPGA-related tree with main, tests, and uart_coprocessor projects referenced by the README tooling notes. Lain-themed HFSDR UI source tree alternate web UI source · Hackin7 repository UI source tree for the related Lain-themed interface; the GitHub Pages deployment timed out during a May 21, 2026 reachability check. Off-By-One 2024 badge writeup attendee writeup · CC BY 4.0 attendee writeup documenting the badge hardware, MicroPython workflow, six challenge flags, Manzel authorship, and source badge photos. NUSGreyhats/greybadge25 badge repository · Public GreyBadge repository whose GitHub description identifies GreyMecha/Army as the GreyCTF 2025 badge. Khong Guan Building CTF Badge writeup badge writeup · Abhinav SP's project-owner writeup documenting the first SINCON badge, hardware components, building design, SMD soldering village, serial CTF behavior, and credits. HFSDR preorder post community preorder · Hackin7's r/Defcon preorder post documenting the DEFCON SG collection context, kit contents, pricing, SDR/FM/waterfall/FFT features, soldering kit details, and link to the public HFSDR repository. HFSDR interest-gauging post community source · Earlier Hackin7 post establishing the public development thread for a DEFCON SG SDR badge and linking forward to the preorder thread. hnr26_badge ESP-IDF component component registry · Espressif Component Registry entry for the NUS Hackers hnr26_badge component used to control LEDs and buttons on the Hack&Roll 2026 badge via the built-in GPIO expander. AiSP community events 2023 event listing · AiSP listing corroborating SINCON Reloaded Conference dates of 5-6 Jan 2023 and Voco Orchard Singapore venue. Off-By-One 2024 event listing event listing · AiSP community event listing for OFF-BY-ONE 2024, June 26-27, 2024, at M Hotel Singapore. DEF CON Singapore 2026 event page event page · Official DEF CON page documenting the April 28-30, 2026 Singapore conference at Marina Bay Sands; it anchors the event context but does not label the HFSDR as the official event badge. DEF CON Singapore 2026 event page event page · Official DEF CON page anchoring the April 28-30, 2026 Singapore host event; it does not classify the TISC trinket as an official admission badge. GreyCTF Summit 2025 page event page · Official NUS Greyhats summit page used for event title, Singapore summit context, July 5, 2025 date, and NUS School of Computing COM1 venue. SINCON about page event page · Official SINCON/IIC page describing SINCON as Singapore's annual premier techno-centric cybersecurity conference tied to Division Zero. X-CTF 2016 event page event page · NUS Greyhats page documenting X-CTF 2016 as a cyber-security competition at NUS School of Computing on June 18, 2016 after online qualifiers. DEF CON Singapore launch report event report · HTX's official report documents the launch event, 11 villages and 19 communities, the inaugural Public Safety Village, and an image alt text identifying a Public Safety Village badge with illuminated emergency-vehicle icons. TISC@DEFCON Singapore 2026 Finals writeup finalist writeup · Finalist report documenting top-50 qualification, six-hour finals format, and the ESP32 BLE mesh challenge trinket handed to each participant. greybadge25 releases firmware and production releases · Release trail with summit_v1/summit_v2 UF2 and filesystem assets, finals firmware assets, and prototype PCB production assets. GreyMecha/Army filesystem README firmware documentation · RP2350 filesystem README documenting CircuitPython basis, image customization, challenge names, update guidance, and contributor credits. HFSDR CH32V305 firmware README firmware documentation · Firmware build and flash notes for the CH32V305 SDR target, including CMake/Ninja/toolchain setup and wchisp flashing workflow. Hack&Roll 2026 firmware README firmware documentation · Repository README for the firmware tree, dice-lighting behavior, hnr26_badge and aw9523 dependencies, and generated documentation notes. HFSDR v1.0 release firmware release · Release published during DEF CON Singapore on 2026-04-29 with an hfsdr.elf asset, anchoring a post-event firmware artifact beyond preorder text. HFSDR v1.1 release firmware release · Post-event release published 2026-05-18; release notes document new graphics and a USB streaming reliability fix. geekman/badger firmware repository · Public firmware repository for the X-CTF 2016 badge, including Arduino-style ESP8266 code, LCD, Wi-Fi scanner, applet, challenge, and game modules. Hack&Roll 2026 badge workshop repository firmware source · MIT-licensed NUS Hackers repository preserving ESP-IDF workshop firmware for the Hack&Roll 2026 hardware badge, component dependencies, documentation links, and badge acknowledgements. Hack&Roll 2026 main firmware firmware source · ESP-IDF C entrypoint showing hnr26_badge initialization, button polling, virtual-pin updates, dice LED control, and 100 ms loop timing. X-CTF 2016 Badge Firmware firmware writeup · Darell Tan's firmware writeup for the badge software, challenge apps, LCD/GPIO support, and post-event code release. rhgndf/hfsdr repository hardware and firmware archive · Public HFSDR archive preserving host software, CH32V305 firmware, KiCad hardware tree, scripts, documentation, WebUSB links, portable mode notes, and project credits. neander hardware README hardware documentation · Repository hardware README pointing to the BOM and production writeup. GreyBadge KiCad hardware tree hardware repository · KiCad project directory with greybadge PCB, RP2350, ECP5 FPGA, TinyFPGA, JLCPCB, library, and production files. jellyjellyrobot/neander hardware repository · Public hardware repository preserving Eagle board and schematic files, BOM notes, libraries, and sponsor image assets; no top-level GitHub license was detected during the 2026-05-21 recheck. Designing the X-CTF 2016 Badge hardware writeup · Darell Tan's hardware-production writeup for the badge, used for component, board, power, display, and manufacturing context. Off-By-One 2024 badge front photo licensed image source · Original front badge photo from the CC BY 4.0 attendee writeup, preserved locally and optimized as the public WebP hero image. Friday Hacks #287 Quack & Roll making-of talk · NUS Hackers talk page for making an electronic badge for over 1,000, covering ideation, artwork, electronics/code, assembly, and programming. Off-By-One official site official conference site · Current official Off-By-One site describing Singapore's annual offensive-security conference and community scope. Public Safety Village preview official preview · HTX preview article framing the first Public Safety Village at DEF CON Singapore and its mission-critical public-safety hacking scope. C517 Village at DEF CON SG official village page · CSIT official C517 Village page documenting TISC@DEF CON SG as a special-edition Capture The Flag with online qualifiers and on-site finals at DEF CON Singapore. HTX@DEF CON SG Public Safety Village official village page · Official HTX page describing the Public Safety Village, AI and IoT Capture The Flag, three public-safety challenge zones, and limited-edition Public Safety Village swag for top CTF finalists. Hack&Roll 2026 recap organizer recap · NUS Hackers recap describing Hack&Roll 2026, Singapore student-hackathon context, January cadence, and the first custom PCB badge participants personalized and hacked during the weekend. Prototype 3 order release production release · Release preserving BOM, CPL, Gerber ZIP, and schematic PDF assets for the public hardware ordering workflow. HFSDR host guide protocol documentation · Repository guide documenting Python and GNU Radio host examples, USB vendor/product/interface details, bulk endpoints, sample-stream format, and WebUSB landing-page descriptor request. Hack&Roll 2026 badge workshop license repository license · Repository MIT license naming NUS Hackers as the 2026 copyright holder for the public firmware/workshop archive. badger firmware license repository license · BSD-3-Clause-style license source naming Darell Tan and Jacob Soo as 2016 copyright holders. greybadge25 README setup and hardware guide · Repository README documenting GreyMecha/Army, CircuitPython setup, hardware ordering notes, FPGA tooling, repository structure, and links to badge manual/talk slides. HFSDR user manual slides user manual · Repository-linked user manual slide deck for the HFSDR device. HFSDR WebUSB UI source tree web UI source · Repository UI source tree for the WebUSB interface used to pair, configure frequency and gain, and display the SDR waterfall; the GitHub Pages deployment timed out during a May 21, 2026 reachability check.

AiSP: Community Events 2023 Retrieved 2026-05-15 · Event-listing source for the SINCON Reloaded Conference date range and Voco Orchard Singapore venue. Association of Information Security Professionals: OFF-BY-ONE 2024 Retrieved 2026-05-15 · Event-context source for the 26-27 Jun 2024 dates and M Hotel Singapore venue. CSIT: C517 Village at DEF CON SG Retrieved 2026-05-15 · Official C517 Village source for TISC@DEF CON SG, online qualifier and on-site final structure, C517 Village context, and CSIT framing. DEF CON: DEF CON Singapore Retrieved 2026-05-15 · Official event-context source for the April 28-30, 2026 DEF CON Singapore conference at Marina Bay Sands; this source does not identify the HFSDR as an official DEF CON badge. DEF CON: DEF CON Singapore Retrieved 2026-05-15 · Official host-event source for the April 28-30, 2026 DEF CON Singapore conference at Marina Bay Sands; this source does not identify the TISC trinket as an official admission badge. Espressif Component Registry: hnr26_badge Retrieved 2026-05-15 · Component registry source for the NUS Hackers MIT-licensed hnr26_badge package that controls LEDs and buttons on the Hack&Roll 2026 badge via the built-in GPIO expander. GitHub / Darell Tan and Jacob Soo: geekman/badger Retrieved 2026-05-15 · Primary firmware repository preserving the BSD-licensed participant firmware and source modules. GitHub / NUSGreyhats: GreyBadge KiCad schematics Retrieved 2026-05-15 · Hardware source for the KiCad project tree, RP2350 sheet, ECP5U_25 FPGA sheet, main schematic, display, power, D-pad, buzzer, PMOD, FPGA programming, and RP2350-FPGA interlink evidence. GitHub / NUSGreyhats: GreyMecha/Army filesystem README Retrieved 2026-05-15 · Firmware source for the CircuitPython basis, GreyCTF finals challenge names, image customization behavior, update guidance, and named contributor credits. GitHub / NUSGreyhats: greybadge25 README Retrieved 2026-05-15 · Primary badge repository source for the GreyMecha/Army badge name, CircuitPython setup, firmware filesystem path, hardware-ordering workflow, separate screen/battery ordering notes, and FPGA tooling. GitHub / NUSGreyhats: greybadge25 releases Retrieved 2026-05-15 · Primary public release trail for summit_v1 and summit_v2 UF2/filesystem firmware assets plus finals and prototype hardware-order assets. GitHub / X-CTF badge team: jellyjellyrobot/neander Retrieved 2026-05-15 · Public hardware repository preserving Eagle board/schematic files, BOM reference, and hardware readme; used as evidence for source availability, not image publication. GitHub / geekman: LICENSE.txt Retrieved 2026-05-15 · Firmware license source for BSD-3-Clause redistribution terms; the hardware repository still lacks a top-level visible license. GitHub / rhgndf: HFSDR CH32V305 firmware README Retrieved 2026-05-15 · Primary firmware source for CH32V305 SDR target build prerequisites and flashing workflow. GitHub / rhgndf: HFSDR host guide Retrieved 2026-05-15 · Primary protocol source for Python/GNU Radio host workflows, USB IDs/interface/endpoints, I/Q sample reconstruction, stream format, and WebUSB descriptor behavior. GitHub / rhgndf: HFSDR v1.0 Retrieved 2026-05-15 · Release source published 2026-04-29 with an hfsdr.elf artifact, giving the HFSDR record a post-event firmware-release anchor. GitHub / rhgndf: HFSDR v1.1 Retrieved 2026-05-15 · Release source published 2026-05-18 documenting new graphics and a USB streaming reliability fix. GitHub / rhgndf: rhgndf/hfsdr Retrieved 2026-05-15 · Primary repository source for HFSDR host software, firmware, hardware design tree, CH32V305 firmware path, WebUSB links, portable mode behavior, user manual link, and project credits. HTX: HTX@DEF CON SG Retrieved 2026-05-15 · Official HTX page for the Public Safety Village, DEF CON Singapore dates and venue, HTX Capture The Flag, public-safety challenge framing, and limited-edition Public Safety Village swag language. HTX: Hack systems that protect at DEF CON Singapore's Public Safety Village Retrieved 2026-05-15 · Official preview source for the Public Safety Village concept and the public-safety technologies in scope before DEF CON Singapore opened. HTX: Inside DEF CON Singapore: Where hackers battle it out to strengthen cybersecurity Retrieved 2026-05-15 · Primary HTX event report for DEF CON Singapore's launch, 11 villages and 19 communities, the Public Safety Village, and the Public Safety Village badge image metadata and photo credit. The article is used as evidence, not as reusable image permission. Hackster.io / Abhinav SP: The Khong Guan Building CTF Badge | SINCON Retrieved 2026-05-15 · Primary project-owner source for the first SINCON badge, ABOV A96S174, CH340G, micro-USB, CR2032, SMD LED soldering, serial CTF operation, six-floor challenge model, and Abhinav SP / Emil credit. Infosec In the City: About SINCON Retrieved 2026-05-15 · Primary event-context source for SINCON's Singapore techno-centric cybersecurity-conference framing and Division Zero tie. NUS Greyhats: GreyCTF Summit 2025 Retrieved 2026-05-15 · Official event-context source for the GreyCTF Summit 2025 name, Singapore summit framing, July 5, 2025 date, and NUS School of Computing COM1 venue. NUS Greyhats: X-CTF 2016 Retrieved 2026-05-15 · Official event source for X-CTF 2016, NUS School of Computing location, June 18, 2016 finals date, and student-team cybersecurity competition framing. NUS Hackers: Friday Hacks #287: Quack & Roll Retrieved 2026-05-15 · Organizer talk source for the badge's Quack & Roll name, 1,000+ electronic-badge making-of framing, and named Terence/Yik Jin speaker context. NUS Hackers: Hack&Roll 2026: Singapore's largest student-run hackathon Retrieved 2026-05-15 · Organizer source for the 2026 event context, first custom PCB badge statement, participant personalization/hacking behavior, and hackathon scale. NUS Hackers / GitHub: LICENSE.md Retrieved 2026-05-15 · Repository license source establishing the MIT basis for the public firmware/workshop code archive, not for copying event photos into the catalogue. NUS Hackers / GitHub: firmware README Retrieved 2026-05-15 · Primary repository documentation for the dice-lighting firmware behavior, hnr26_badge badge-specific I/O component, aw9523 GPIO-expander dependency, and documentation path. NUS Hackers / GitHub: nushackers/hnr26-badge-workshop Retrieved 2026-05-15 · Primary public source for the ESP-IDF workshop firmware archive, Hack&Roll 2026 hardware-badge scope, ESP32-C3-WROOM-02-N4 sponsor note, component dependencies, documentation links, and acknowledgements. Off-By-One: OFF-BY-ONE 2026 Retrieved 2026-05-15 · Current official site source for Off-By-One as Singapore's annual cybersecurity conference for offensive-security practitioners; used as conference-lineage context, not as 2024 badge hardware evidence. U-Zyn Chua: TISC@DEFCON Singapore 2026 Finals Retrieved 2026-05-15 · First-hand finalist source for the top-50 finalist group, six-hour five-challenge finals, and ESP32 BLE mesh hardware trinket handed to each participant. elmo: Off-By-One 2024 Hardware Badge Retrieved 2026-05-15 · Primary attendee source for the Off-By-One 2024 hardware badge, dual-controller design, dual GC9A01 screens, IR, SAO connector, WS2812 LEDs, MicroPython challenge workflow, six flags, Manzel credit, and CC BY 4.0 image license. irq5.io / Darell Tan: Designing the X-CTF 2016 Badge Retrieved 2026-05-15 · Primary badge-maker hardware source for the custom X-CTF 2016 electronic badge, ESP8266 platform, LCD, buttons, LiPo power, USB serial programming, manufacturing constraints, sponsor artwork, and public hardware handoff. irq5.io / Darell Tan: X-CTF 2016 Badge Firmware Retrieved 2026-05-15 · Primary badge-maker software source for the firmware architecture, CTF apps, Wi-Fi scanning, LCD/GPIO drivers, and public firmware release. r/Defcon / Hackin7: Gauging interest in DEFCON SG SDR badge Retrieved 2026-05-15 · Earlier public source tying Hackin7 to development of a DEFCON SG SDR badge and documenting the intended FM/SDR scope before preorder publication. r/Defcon / Hackin7: hfsdr preorders for DEFCON SG Retrieved 2026-05-15 · First-hand community preorder source for DEFCON SG pickup, HFSDR kit contents, SMA/antenna/encoder/screen/LED parts, 50-60 SGD pricing, RF up to 300 MHz, onboard FM demodulation, waterfall/FFT display, LiPo charger, reprogrammability, and repository link.