About Me

Basic Information

Handle Name

kcz or Cookies or こおしいず ¹

PGP Fingerprint

598C8E59DE9C21FFEB434A3E 80B59E49 D6D9B0FD [Keybase]

Education

Graduated from Dept. of Information Science, School of Science, Univ. of Tokyo

From

Niigata, Japan

License :

• Class 1 Driver’s License in Japan
• KanKen Grade 3
• SuKen Pre-2nd Grade
• EIKEN 2nd Grade
• Applied Information Technology Engineer Examination

Community :

• FetchDecodeExecWrite (an ISUCON team)
• Theoretical Science Group (a club in the University of Tokyo + a CTF team)
• wasamusume (a CTF team)

SNS Accounts

Please visit links.

Activities

• ISUCON book review: reviewed a part of a Japanese book about web service performance tuning from ISUCON contest perspective. Title: 達人が教えるWebパフォーマンスチューニング 〜ISUCONから学ぶ高速化の実践, ISBN: 978-4-297-12846-3 [技術評論社 (publisher)], [Amazon.co.jp]
• CTF book review: reviewed the Web genre part of a Japanese book about CTF. Title: 詳解セキュリティコンテスト CTFで学ぶ脆弱性攻略の技術, ISBN: 978-4-8399-7349-0 [マイナビ出版 (publisher)], [Amazon.co.jp]
• TSG CTF 2021: hosted a 24hr CTF with TSG members. [ctftime]
• ISUCON11: participated in Quals and got 3rd in Final as a team “FetchDecodeExecWrite”.
• Google CTF 2020: 2nd in Finals after 18th in Quals as a team “I Use Bing” (a joint team made of several Korean and Japanese independent teams). [video]
• LINE CTF 2021: 7th as a team “TSG”.
• ISUCON10: participated in Quals and got 6th in Final as a team “FetchDecodeExecWrite”.
• TokyoWesterns CTF 6th 2020: 9th as a team “TSG”.
• TSG CTF 2020: hosted a 24hr CTF with TSG members. authored 1 challenge. [ctftime]
• CTFZone 2020: 7th in Finals after 10th in Quals as a team “TSG”.
• ISUCON9: participated in Quals and Final as a team “FetchDecodeExecWrite”.
• TSG CTF: hosted a 24hr CTF with TSG members. authored 3 challenges. [ctftime]
• ISUCON8: 2nd in Quals and participated in Final a team “FetchDecodeExecWrite”(moratorium, akouryy and me) [my blog]
• CODE BLUE CTF 2018 Quals: 4th as a team “TSG”(many)
• CODE FESTIVAL 2015: passed Qual A (122nd) and participated in onsite event CODE FESTIVAL 2015.
• ACM ICPC 2015 Domestic Quals: 12nd as a team “tekito”(satos, kivantium and me), but I did nothing but printing.
• Security Camp 2013 in Tokyo: tutor in Software Security class
• SECCON CTF 2012 Final: 2nd prize as a team “wasamusume”(mimura, carme, dec, atgw, ytn and me) [blog]
• SECCON CTF 2012 in Yokohama: 1st as a team “wasamusume”
• Security Camp 2012 in Tokyo: student of Software Security class (in CTF, won 1st prize as a team "|" (4 members including me) and MVP as an individual)

About This Site

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