Taekkyung Oh is a Ph.D student in System Security Lab at KAIST, advised by Professor Yongdae Kim. He received a Master degree from Graduate School of Information Security at KAIST. His research interests are Security Engineering, Cellular Network Security, Cyber-Physical System (CPS) Security, and Voice Authentication.

  • Affliation: KAIST
  • Location: South Korea
  • Email: ohtk[at]

Research Interests

Security Engineering

Cellular Network Security

Cyber-Physical System (CPS) Security

Voice Authentication & Speech Recognition


Ph.D of Engineering

September, 2021 - Present

Graduate School of Information Security in KAIST

Master of Engineering

September, 2019 - August, 2021

Graduate School of Information Security in KAIST

Bachelor of Engineering

March, 2012 - August, 2019

Electronic and Electrical Engineering in SKKU

Computer Engineering in SKKU


Void: A fast and light voice liveness detection system [PDF]

Muhammad Ejaz Ahmed, Il-Youp Kwak, Jun Ho Huh, Iljoo Kim, Taekkyung Oh, and Hyoungshick Kim Proceedings of the 29th USENIX Security Symposium (Security'20)

Hey Siri – are you there?: Jamming of voice commands using the resonance effect [PDF]

Taekkyung Oh, William Aiken, and Hyoungshick Kim The 4th International Conference on Software Security and Assurance (ICSSA'18)

Poster: I Can’t Hear This Because I Am Human: A Novel Design of Audio CAPTCHA System [PDF]

Jusop Choi, Taekkyung Oh, William Aiken, Simon S. Woo, and Hyoungshick Kim Proceedings of the 11st ACM Asia Conference on Computer and Communications Security (ASIACCS'18)

Vulnerability Reports

Vulnerability of radio control mechanism in LTE networks [WWW]

GSMA Coordinated Vulnerability Disclosure | May, 2023



Tracking and identifying devices and call traffic in voice phishing ecosystem

National Police Agency, South Korea | April, 2022 - September, 2024

Project Manager

Invited Talks

Security Intelligence Summit (SIS) 2022 .ON

S2W Inc. | November, 2022

Voice Phisher Intelligence: Location tracking and infrastructure vulnerability analysis


Undergraduate Research Conference by College of Software

SKKU | November, 2018

Bronze Prize

Dean's List

SKKU | September, 2017 & September, 2018

Reward for students who got obvious scholar performance (Top 5%)

Global Idea Contest

Dongbu Daewoo Electronics | November, 2017 Development of noise canceling technique for home appliances

Honorable Metion

Idea Contest of Assistive Technology Device for Students with Disability

Ministry of Education, South Korea | December, 2016 Development of function-graph converter for blind

First Prize (Award by Minister of Education)


Ministry of Education, South Korea

December, 2019

Software Development Advisor

Security Lab, SKKU [WWW]

December, 2016 - December, 2018

Undergraduate Researcher

System Consultant Group, SKKU [WWW]

March, 2016 - July, 2017

Web Developer

Republic of Korea Army

October, 2013 - June, 2015

Combat Engineer