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Write-ups officiels — ESPILON CTF, Édition 2026
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Eun0us 6a0877384d [+] Writeups v2 — sync solves, real points, scoreboard stats, cleanup 
- Remove undeployed challenges: Phantom_Byte, Cr4cK_w1f1, Lain_Br34kC0r3 V1,
  Lain_VS_Knights, Lets_All_Love_UART, AETHER_NET, Last_Train_451, Web3/
- Sync 24 solve/ files from main CTF-Espilon repo
- Update all READMEs with real CTFd final scores at freeze
- Add git-header.png banner
- Rewrite README: scoreboard top 10, edition stats (1410 users, 264 boards,
  1344 solves), correct freeze date March 26 2026
2026-03-27 21:27:45 +01:00
ESP [+] Writeups v2 — sync solves, real points, scoreboard stats, cleanup 2026-03-27 21:27:45 +01:00
Hardware [+] Writeups v2 — sync solves, real points, scoreboard stats, cleanup 2026-03-27 21:27:45 +01:00
Intro/The_Wired [+] Writeups v2 — sync solves, real points, scoreboard stats, cleanup 2026-03-27 21:27:45 +01:00
IoT [+] Writeups v2 — sync solves, real points, scoreboard stats, cleanup 2026-03-27 21:27:45 +01:00
Misc [+] Writeups v2 — sync solves, real points, scoreboard stats, cleanup 2026-03-27 21:27:45 +01:00
OT [+] Writeups v2 — sync solves, real points, scoreboard stats, cleanup 2026-03-27 21:27:45 +01:00
screens [+] Writeups v2 — sync solves, real points, scoreboard stats, cleanup 2026-03-27 21:27:45 +01:00
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README.md [+] Writeups v2 — sync solves, real points, scoreboard stats, cleanup 2026-03-27 21:27:45 +01:00

README.md

ESPILON CTF 2026

ESPILON CTF 2026 — Official Write-ups

Official write-ups for ESPILON CTF 2026, a hardware/IoT/OT themed CTF set in the Serial Experiments Lain universe.

Challenges remain accessible at ctf.espilon.net. Scoreboard frozen as of March 26, 2026.

Edition Stats

Stat Value
Registered participants 1 410
Players on scoreboard 264
Total correct solves 1 344
Challenges 25
Categories 6

Scoreboard — Top 10

Rank Player Score
1 silent 7 397
2 Khalid 5 903
3 0xkakashi 5 504
4 BRODSKY 5 500
5 s13w00 5 500
6 mungsul 5 403
7 bridgingdragon 5 403
8 pavel?! 5 300
9 fun88337766 5 005
10 D4RKCYPH3R 5 005

Points shown are final decayed values at scoreboard freeze (March 26, 2026).

Challenge Index

# Challenge Category Difficulty Points
1 ESP Start ESP Easy 100
2 Jnouned Router ESP Multi 100+200+300+400
3 CAN Bus Implant Hardware Medium-Hard 400
4 Glitch The Wired Hardware Medium-Hard 100
5 NAVI I2C Sniff Hardware Medium-Hard 442
6 Phantom JTAG Hardware Medium-Hard 464
7 Serial Experimental 00 Hardware Easy 50
8 Signal Tap Lain Hardware Easy 100
9 Wired SPI Exfil Hardware Medium-Hard 100
10 The Wired Intro Easy 80
11 Anesthesia Gateway IoT Medium-Hard 495
12 Lain Br34kC0r3 V2 IoT Hard 150
13 Lets All Hate UART IoT Medium-Hard 100
14 Nurse Call IoT Easy 50
15 Observe The Wired IoT Medium-Hard 499
16 Wired Airwave 013 IoT Medium 398
17 Accela Signal Misc Hard 536
18 LAYER ZERO Misc Hard 479
19 Patient Portal Misc Medium-Hard 340
20 Cyberia Grid OT Medium-Hard 500
21 Operating Room OT Medium-Hard 500
22 Protocol Seven OT Hard 513
23 Schumann Resonance OT Medium 196
24 Tachibana SCADA OT Medium-Hard 413

Categories

Category Description
ESP ESP32 firmware — flashing, UART, WiFi, custom protocols
Hardware Bus interfaces — UART, I2C, SPI, JTAG, CAN, signal decoding, voltage glitching
Intro Entry point — ESPILON bot C2 infrastructure
IoT IoT protocols — MQTT, CoAP, UART, SDR/FSK
Misc Mixed — signal processing, web exploitation, multi-pivot
OT Industrial protocols — Modbus, BACnet, OPC-UA, EtherNet/IP

Author: Eun0us — ESPILON CTF 2026