Turning theories into innovation, Theori tackles the most difficult cybersecurity challenges from an attacker’s perspective and conquers them as the best strategic security experts.

Our goal is to lead the industry at the top of our game, train the next generation of security leaders, and raise the standards of security through unwavering ethical transparency.

Brian Pak

Theori Co-founder & CEO

We hack hackers and lead at the forefront of cybersecurity.

Offensive security is a proactive approach to protecting computer systems, networks and individuals from attacks. The security and stability of services and products are tested from an attacker perspective, so that they can be fixed before malicious attacks.

Awards & Achievements

Theori remains steadfast in our commitment to being at the forefront of cybersecurity innovation—fostering a secure digital future for all.

ACDC (AI Cyber Defense Contest) 2025

2nd

AI Cyber Challenge Finals 2025

3rd

CODEGATE 2025

3rd

Cyber Conflict Exercise 2025

1st

DEF CON 33

1st

ACDC (AI Cyber Defense Contest) 2025

2nd

AI Cyber Challenge Finals 2025

3rd

CODEGATE 2025

3rd

Cyber Conflict Exercise 2025

1st

DEF CON 33

1st

ELECCON 2025

3rd

HACKSIUM BUSAN

1st

LINE CTF 2025

1st

Operation Cloudfall

1st

POC CTF 2025

1st

ELECCON 2025

3rd

HACKSIUM BUSAN

1st

LINE CTF 2025

1st

Operation Cloudfall

1st

POC CTF 2025

1st

Raising the standard of security at every turn.

2025

Oct

'AI Hacker Xint' Official Launch Press Conference

May

Cyber Training Program 'Upside Academy 3' launched

May

Forged Strategic Cybersecurity Partnership with ‘Okta’

May

Cybersecurity Education Platform 'Dreamhack' Launched Paid Subscription Service

Apr

Beta launch of LLM Guard & Monitoring Model, ‘αprism’

2024

Aug

AIxCC(hosted by DARPA) Semi-final winner

May

Beta launch of AI-Powered Application Security Testing, ‘Xint’

Apr

'Presidential Commendation' from the President of South Korea

2023

Sep

Blockchain security risk management platform ChainLight DART launched

Jul

'Appreciation Plaque for Information Security Education' from the National Intelligence Service of Korea

2022

Sep

Blockchain security audit service ‘ChainLight’ launched

Sep

Chain data attestation protocol ‘Relic Protocol’ launched

Aug

Cybersecurity Training Program ‘Dream Academy’ launched

Jul

K-Cybersecurity Excellence Award from the Ministry of Foreign Affairs

Jun

$15.5 million seed round funding led by K2G Fund

2021

Sep

Bug bounty platform ‘PatchDay’ launched

Jun

Corporate cybersecurity education platform ‘Dreamhack Enterprise’ launched

2020

Apr

Cybersecurity education platform 'Dreamhack’ launched

2019

May

Threat intelligence database 'Fermium-252' launched

2018

Sep

Funding from NAVER

2017

Sep

Theori Korea established

2016

Jan

Theori Inc. established

Backed By

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Our Clients

Information Security Management System
ISO/IEC 27001:2022 Certified