GrayHash is a research-oriented corporation based on idea 'offensive skills are essential for defense tactics'. We are doing various businesses with lots of clients based on offensive techniques and are trying to make the Internet a safer place. Members of GrayHash have rich experience in security field, not only making awesome scores in international CTFs/conferences but also organizing many of them. We are growing fast with our major clients from IT, electronics, games, messenger services, mobile fields and we are also working with government agencies on various research projects.

  - LIG Nexone Consulting
  - LG Electronics Consulting
  - ETRI security research project
  - CSTEC security research project
  - SKT mobile security consulting
  - Korean Air Consulting (via Mogha)
  - Government agency security research project

  - BoB training/education - participated as mentors
  - GrayHash hardware hack training (IoT, Embedded devices)
  - GrayHash reverse engineering training
  - GrayHash web hack training
  - GrayHash web browser hack training

  - Speaker at VXCOX, Hongkong
  - Speaker at ICIS, Seoul
  - Speaker at IDG Conference, Seoul
  - Speaker at IDG Conference, Gothenburg, Sweden
  - Speaker at Koccag, Seoul
  - Media: tvN Cool-kka-dang of SeungJoon Kwak program
  - Media: KBS t-time of Reporter Cha program
  - Media: KBS collection-file program
  - Media: KBS deep-insignt program

  - Naver NBP security consulting
  - Republic of Korea Cyber-command security research project
  - ETRI security research project
  - CSTEC security research project
  - SKT mobile security consulting
  - Korea Atomic Energy Research Institute security consulting
  - CONIFER INC. security consulting
  - SKT embedded devices security consulting
  - CODEGATE incorporated association consulting
  - LINE Japan security consulting
  - SKT security consulting
  - Government agency security research project

  - BoB training/education - participated as mentors
  - GrayHash hardware hack training
  - GrayHash web hack training
  - GrayHash web browser hack training

GrayHash Inc. incorporated (2014 June)
Nominated as SKT's parter company

  - LINE Japan security consulting
  - Korea Atomic Energy Research Institute security consulting
  - ETRI security research project
  - SKT security consulting
  - Built cyber-war training system for BoB
  - Built Tigerteam Academy web hack hands on system
  - CODEGATE 2014 international CTF organizer
  - Research project on government APT case's attack techniques

  - BoB training/education - participated as mentors
  - KISA information security lecture
  - Samsung SDS information security lecture
  - Republic of Korea's Cyber-command information security lecture

  - Samsung SDS pen-test system project
  - Samsung Electronics Mobile Division's product security project
  - Samsung Electronics mobile product security project
  - Samsung Electronics Home Appliances Division security consulting
  - SECUINSIDE 2013 international CTF organizer
  - ETRI Junior CTF organizer
  - KAMUSE security consulting
  - KISA security research project
  - SKT mobile app security consulting project

  - BoB training/education - participated as mentors
  - WinsTechnet training for 0-day hunting
  - Research seminar on SEJONG University professors
  - Information security seminar for National Information Security Education Center (now CSTEC)
  - Information security lector for Korea University's Dept of Cyber Defense
  - Samsung SDS lecture on reverse engineering and security
  - KISA information security lecture for Rwanda
  - NEXON information security lecture

  - Speaker at NETSEC conference, Romania
  - Speaker at BLACKHAT, Las Vegas US
  - Speaker at EDSC conference, Seattle US
  - Speaker at HITCON conference, Taiwan
  - Speaker at AVTOKYO conference, Tokyo Japan 발표
  - Speaker at TROOPERS conference, Germany
  - Speaker at CANSECWEST conference, Vancouver Canada
  - Speaker at ISEC conference

  – Samsung Electronics Software Division security project (mobile product)
  – SK Communications security consulting project
  – KISA security research project

  – BoB training/education - participated as mentors
  – Samsung Electronics Advanced Technology Training Institute lecture to product security manager
  – NHN Japan lecture on Android security

  – SECUINSIDE conference organizer, keynote speaker
  – Speaker at SYSCAN conference, Singapore
  – Speaker at WAIGAYA conference, Japan
  – Speaker at CODEENGN conference, Seoul Korea
  – Speaker at ISEC conference
  – Panel speaker at netsec-kr 2012, Korea

SeungJin Lee "Offensive research is necessary for effective defense technology" (KOR)
CODEGATE 2014 international CTF Finals ... report on site (KOR)
CODEGATE 2014, 'Junior international CTF' being held (KOR)
World's top class security experts shares their thoughts as BoB mentors (KOR)
Next generation security leader training program BoB 3rd generation launch ceremony held (KOR)
[Issue analysis] IoT without security measures can 'call catastrophe'
'Hackers gather to build a thinktank' SeungJin Lee, CEO GrayHash
Hackers above hackers have a bout on 'overground' (KOR)
A startup of 4 begins social contribution by training white hat hackers (KOR)
Infosec, invest on industry or manpower? or both? (KOR)
Next generation infosec leader 130 starts competition for top ranks (KOR)

GrayHash starting WhiteHash - scholarship for young hackers (KOR)
Is our government encouraging hackers the right way? (KOR)
Junior CTF with 350 participants for prequals, 30 goes to final (KOR)
Teenager white hat hackers' competition, Junior CTF launched (KOR)
[NETSEC-KR] Hack incidents for smart home appliances comes real. Is there a plan? (KOR)
22 more experts as mentors for Best of the Best gen 2…with more real-life training (KOR)
It's fun to learn to hack! Interviewing future white hat hackers (KOR)
“Countermeasure urgent for smart TV hacks” (KOR)
Smart TV can get hacked and take pictures of you.. (KOR)
If your Smart TV is hacked, your room can be observed - need urgent countermeasure (KOR)
[Deep-dive] Smart TV hack can get your room observed (KOR)
'Smart TV hack', Right after you (KOR)
Smart TV, open to hack with no barrier…'TV-shing' emergency (KOR)
KTV Broadcast, your rights are gone, protect personal information (KOR)
ISEC 2013 who's the best speaker? (KOR)

Awesome tips for infosec starters! (KOR)
Naver open to multiple XSS vulnerability even after short-time's check (KOR)
SECUINSIDE 2012 opening at July 10~11 (KOR)
Interview with the Six, at the training site of the 1st BoB program (KOR)
“Domestic softwares needs much better security than they do now, having used by all public organization” (KOR)
[SyScan] Beist-Ryan “HWP multiple 0-day vulnerabilities” (KOR)
What hackers say about how infosec manpower should be trained - full (KOR)
How the technical level of hacking affects in trial (KOR)
Trial cases on responsibility of hacked companies based on their efforts of prevention (KOR)
How to get your 0-day vulnerability rewarded in legal way (KOR)
KBS Korea's Happiness Generator <terrifying fishing, Phishing crimes> (KOR)
Finding 0-day vulnerabilities with binary diffing style (KOR)
Who's in charge of BoB mentoring - next generation infosec leader training program - ? (KOR)

GrayHash, 6th floor, Jeongja-yeok Plaza, 345, Seongnam-daero, Bundang-gu, Seongnam-si, Gyeonggi-do, Republic of Korea