SECCON 15 Dennou Kaigi
Overview
Japan's largest security contest series, run by JNSA since 2012. The Dennou Kaigi conference opens the CTF finals, fought by domestic and international teams that survived the online qualifiers, to the public alongside talks, workshops, and CTF for GIRLS. The 15th edition takes place in Asakusabashi, Tokyo on February 20-21, 2027 with free admission, serving as a key venue for discovering hands-on security talent among companies and students alike.
Speakers from past editions
- Satoshi Mimura (SECCON executive committee chair, 2026)
- Toshinori Usui (NTT Social Informatics Laboratories, 2026 Dennou Kaigi speaker)
- Jonathan Bar Or (security researcher, CrowdStrike, 2026 Dennou Kaigi speaker)
Foundation
- Founded
- 2012
- Founder
- SECCON Executive Committee, Japan Network Security Association (JNSA)
Launched in 2012 by a volunteer committee within JNSA to discover and train globally competitive security talent. Beyond the flagship CTF, it broadens the community through SECCON Beginners CTF for newcomers and CTF for GIRLS.
Transition
- 2012 First SECCON held, hosted by JNSA
- 2025 SECCON 14 online qualifiers held December 13-14
- 2026 SECCON 14 Dennou Kaigi and CTF finals held February 28 to March 1 at HULIC HALL Asakusabashi, with 18 teams from Japan and abroad
- 2026 SECCON Beginners CTF 2026 held online on June 13-14
- 2027 SECCON 15 Dennou Kaigi on February 20-21 (qualifier dates not yet announced)
Voices
Competed in the domestic finals with team BunkyoWesterns, finishing 5th of 9, and recounts the two days of Jeopardy and King of the Hill formats plus using LLMs to solve challenges (from st98's finals write-up, in Japanese)
Committee chair Satoshi Mimura discusses the aims of the SECCON 13 Dennou Kaigi and its dual design of contest and public event (from GMO Developers' event report, in Japanese)
Sponsors
Platinum Sponsor プラチナスポンサー
-
GMOインターネット
Gold Sponsor ゴールドスポンサー
-
日本電気株式会社
Silver Sponsor シルバースポンサー
-
株式会社インターネットイニシアティブ -
SCSKセキュリティ株式会社 -
ＮＲＩセキュアテクノロジーズ株式会社 -
パナソニックオートモーティブシステムズ株式会社
Bronze Sponsor ブロンズスポンサー
-
株式会社エヌ・エフ・ラボラトリーズ -
株式会社サイバーディフェンス研究所 - サイボウズ株式会社
-
BarrierCrack合同会社 -
フューチャーセキュアウェイブ株式会社 -
株式会社日本レジストリサービス -
任天堂株式会社 -
株式会社三菱ＵＦＪ銀行 -
株式会社ラック
Infra Sponsor インフラスポンサー
-
さくらインターネット株式会社
Source: official sponsor list (as of October 9, 2026)
CEATEC
Japan's largest IT and electronics exhibition. Organized by JEITA, held annually in October at Makuhari Messe. The 2026 theme is 'Transformation.' Over 800 exhibitors and approximately 100,000 visitors. Free admission with registration.
Japan Mobility Show Bizweek 2026
A B2B mobility co-creation event hosted by the Japan Automobile Manufacturers Association (JAMA). Held in the interim year of the main Japan Mobility Show (biennial at Tokyo Big Sight, drawing about one million visitors), co-located with CEATEC at the same venue and dates. Focused on business matching among automakers, startups, universities, and cross-industry companies, with the online matching tool Meet-up Box available before and after the show.
GREE Tech Conference 2026
A technology conference hosted by GREE Holdings under the theme "How We Build", framed around the process of development rather than the finished product. Three parallel tracks cover AI, data analysis, game development, infrastructure, and security, with a keynote by the company's Masaki Fujimoto. Free to attend in a hybrid format, including seats that come with an office tour.