An intelligent GGSN dispatching mechanism for UMTS. - Shin-Ming Cheng; Phone Lin; Guan-Hua Tu; Li-Chen Fu; Ching-Feng Liang (Comput. Commun., 2005)

An Improved GGSN Failure Restoration Mechanism for UMTS. - Phone Lin; Guan-Hua Tu (Wirel. Networks, 2006)

Mobile data charging: new attacks and countermeasures. - Chunyi Peng 001; Chi-Yu Li 001; Guan-Hua Tu; Songwu Lu; Lixia Zhang 001 (CCS, 2012)

Can we pay for what we get in 3G data access? - Chunyi Peng 001; Guan-Hua Tu; Chi-Yu Li 001; Songwu Lu (MobiCom, 2012)

How voice calls affect data in operational LTE networks. - Guan-Hua Tu; Chunyi Peng 001; Hongqi Wang; Chi-Yu Li 001; Songwu Lu (MobiCom, 2013)

Accounting for roaming users on mobile data access: issues and root causes. - Guan-Hua Tu; Chunyi Peng 001; Chi-Yu Li 001; Xingyu Ma; Hongqi Wang; Tao Wang 004; Songwu Lu (MobiSys, 2013)

Real Threats to Your Data Bills: Security Loopholes and Defenses in Mobile Data Charging. - Chunyi Peng 001; Chi-Yu Li 001; Hongyi Wang; Guan-Hua Tu; Songwu Lu (CCS, 2014)

Control-plane protocol interactions in cellular networks. - Guan-Hua Tu; Yuanjie Li; Chunyi Peng 001; Chi-Yu Li 001; Hongyi Wang; Songwu Lu (SIGCOMM, 2014)

Insecurity of Voice Solution VoLTE in LTE Mobile Networks. - Chi-Yu Li 001; Guan-Hua Tu; Chunyi Peng 001; Zengwen Yuan; Yuanjie Li; Songwu Lu; Xinbing Wang (CCS, 2015)

How voice call technology poses security threats in 4G LTE networks. - Guan-Hua Tu; Chi-Yu Li 001; Chunyi Peng 001; Songwu Lu (CNS, 2015)

iCellular: Define Your Own Cellular Network Access on Commodity Smartphones. - Yuanjie Li; Haotian Deng 001; Chunyi Peng 001; Guan-Hua Tu; Jiayao Li; Zengwen Yuan; Songwu Lu (CoRR, 2015)

New Threats to SMS-Assisted Mobile Internet Services from 4G LTE Networks. - Guan-Hua Tu; Yuanjie Li; Chunyi Peng 001; Chi-Yu Li 001; Muhammad Taqi Raza; Hsiao-Yun Tseng; Songwu Lu (CoRR, 2015)

Control-Plane Protocol Interactions in Mobile Networks. - Guan-Hua Tu (2015)

New Security Threats Caused by IMS-based SMS Service in 4G LTE Networks. - Guan-Hua Tu; Chi-Yu Li 001; Chunyi Peng 001; Yuanjie Li; Songwu Lu (CCS, 2016)

iCellular: Device-Customized Cellular Network Access on Commodity Smartphones. - Yuanjie Li; Haotian Deng 001; Chunyi Peng 001; Zengwen Yuan; Guan-Hua Tu; Jiayao Li; Songwu Lu (NSDI, 2016)

VoLTE*: A Lightweight Voice Solution to 4G LTE Networks. - Guan-Hua Tu; Chi-Yu Li 001; Chunyi Peng 001; Zengwen Yuan; Yuanjie Li; Xiaohu Zhao; Songwu Lu (HotMobile, 2016)

Detecting Problematic Control-Plane Protocol Interactions in Mobile Networks. - Guan-Hua Tu; Yuanjie Li; Chunyi Peng 001; Chi-Yu Li 001; Songwu Lu (IEEE/ACM Trans. Netw., 2016)

The Insecurity of Home Digital Voice Assistants - Amazon Alexa as a Case Study. - Xinyu Lei; Guan-Hua Tu; Alex X. Liu; Chi-Yu Li 001; Tian Xie 001 (CoRR, 2017)

The Insecurity of Home Digital Voice Assistants - Vulnerabilities, Attacks and Countermeasures. - Xinyu Lei; Guan-Hua Tu; Alex X. Liu; Chi-Yu Li 001; Tian Xie 001 (CNS, 2018)

The Dark Side of Operational Wi-Fi Calling Services. - Tian Xie 001; Guan-Hua Tu; Chi-Yu Li 001; Chunyi Peng 001; Jiawei Li; Mi Zhang 002 (CNS, 2018)

Mobile Edge Computing Platform Deployment in 4G LTE Networks: A Middlebox Approach. - Chi-Yu Li 001; Hsueh-Yang Liu; Po-Hao Huang; Hsu-Tung Chien; Guan-Hua Tu; Pei-Yuan Hong; Ying-Dar Lin (HotEdge, 2018)

V2PSense: Enabling Cellular-Based V2P Collision Warning Service through Mobile Sensing. - Chi-Yu Li 001; Giovanni Salinas; Po-Hao Huang; Guan-Hua Tu; Guo-Huang Hsu; Tien-Yuan Hsieh (ICC, 2018)

How Voice Service Threatens Cellular-Connected IoT Devices in the Operational 4G LTE Networks. - Tian Xie 001; Chi-Yu Li 001; Jiliang Tang; Guan-Hua Tu (ICC, 2018)

The Untold Secrets of Operational Wi-Fi Calling Services: Vulnerabilities, Attacks, and Countermeasures. - Tian Xie 001; Guan-Hua Tu; Bangjie Yin; Chi-Yu Li 001; Chunyi Peng 001; Mi Zhang 002; Hui Liu 031; Xiaoming Liu 002 (CoRR, 2018)

Device-Customized Multi-Carrier Network Access on Commodity Smartphones. - Yuanjie Li; Chunyi Peng 001; Haotian Deng 001; Zengwen Yuan; Guan-Hua Tu; Jiayao Li; Songwu Lu; Xi Li 003 (IEEE/ACM Trans. Netw., 2018)

SecEQP: A Secure and Efficient Scheme for SkNN Query Problem Over Encrypted Geodata on Cloud. - Xinyu Lei; Alex X. Liu; Rui Li 020; Guan-Hua Tu (ICDE, 2019)

Exploring the Insecurity of Google Account Registration Protocol via Model Checking. - Tian Xie 001; Sihan Wang 002; Guan-Hua Tu; Chi-Yu Li 001; Xinyu Lei (SSCI, 2019)

Fast and Secure kNN Query Processing in Cloud Computing. - Xinyu Lei; Guan-Hua Tu; Alex X. Liu; Tian Xie 001 (CNS, 2020)

An Inter-blockchain Escrow Approach for Fast Bitcoin Payment. - Xinyu Lei; Tian Xie 001; Guan-Hua Tu; Alex X. Liu (ICDCS, 2020)

Ghost calls from operational 4G call systems: IMS vulnerability, call DoS attack, and countermeasure. - Yu-Han Lu; Chi-Yu Li 001; Yao-Yu Li; Sandy Hsin-Yu Hsiao; Tian Xie 001; Guan-Hua Tu; Wei-Xun Chen (MobiCom, 2020)

SecWIR: securing smart home IoT communications via wi-fi routers with embedded intelligence. - Xinyu Lei; Guan-Hua Tu; Chi-Yu Li 001; Tian Xie 001; Mi Zhang 002 (MobiSys, 2020)

Security Threats from Bitcoin Wallet Smartphone Applications: Vulnerabilities, Attacks, and Countermeasures. - Yiwen Hu 002; Sihan Wang 002; Guan-Hua Tu; Li Xiao 001; Tian Xie 001; Xinyu Lei; Chi-Yu Li 001 (CODASPY, 2021)

BFastPay: A Routing-free Protocol for Fast Payment in Bitcoin Network. - Xinyu Lei; Guan-Hua Tu; Tian Xie 001; Sihan Wang 002 (CODASPY, 2021)

Insecurity of operational cellular IoT service: new vulnerabilities, attacks, and countermeasures. - Sihan Wang 002; Guan-Hua Tu; Xinyu Lei; Tian Xie 001; Chi-Yu Li 001; Po-Yi Chou; Fu-Cheng Hsieh; Yiwen Hu 002; Li Xiao 001; Chunyi Peng 001 (MobiCom, 2021)

How Can IoT Services Pose New Security Threats In Operational Cellular Networks? - Tian Xie 001; Guan-Hua Tu; Chi-Yu Li 001; Chunyi Peng 001 (IEEE Trans. Mob. Comput., 2021)

The Untold Secrets of WiFi-Calling Services: Vulnerabilities, Attacks, and Countermeasures. - Tian Xie 001; Guan-Hua Tu; Bangjie Yin; Chi-Yu Li 001; Chunyi Peng 001; Mi Zhang 002; Hui Liu 031; Xiaoming Liu 002 (IEEE Trans. Mob. Comput., 2021)

Uncovering insecure designs of cellular emergency services (911). - Yiwen Hu 002; Min-Yue Chen; Guan-Hua Tu; Chi-Yu Li 001; Sihan Wang 002; Jingwen Shi; Tian Xie 001; Li Xiao 001; Chunyi Peng 001; Zhaowei Tan; Songwu Lu (MobiCom, 2022)

Wi-Fi-Based Tracking of Human Walking for Home Health Monitoring. - Chi-Lun Lin; Wen-Jia Chang; Guan-Hua Tu (IEEE Internet Things J., 2022)

When Good Turns Evil: Encrypted 5G/4G Voice Calls Can Leak Your Identities. - Jingwen Shi; Tian Xie 001; Guan-Hua Tu; Chunyi Peng 001; Chi-Yu Li 001; Andrew Z. Hou; Sihan Wang 002; Yiwen Hu 002; Xinyu Lei; Min-Yue Chen; Li Xiao 001; Xiaoming Liu 002 (CNS, 2023)

Remote Detection of 4G/5G UEs Vulnerable to Stealthy Call DoS. - Man-Hsin Chen; Chiung-I Wu; Yin-Chi Li; Chi-Yu Li 001; Guan-Hua Tu (INFOCOM Workshops, 2023)

A Runtime Anomaly Detector via Service Communication Proxy for 5G Mobile Networks. - Yin-Chi Li; Ping-Tsan Liu; Yi-An Tai; Che-Hung Liu; Man-Hsin Chen; Chi-Yu Li 001; Guan-Hua Tu (INFOCOM Workshops, 2023)

The Security in Optical Wireless Communication: A Survey. - Xiao Zhang 037; Griffin Klevering; Xinyu Lei; Yiwen Hu 002; Li Xiao 001; Guan-Hua Tu (ACM Comput. Surv., 2023)

Unveiling the Insecurity of Operational Cellular Emergency Services (911): Vulnerabilities, Attacks, and Countermeasures. - Yiwen Hu 002; Min-Yue Chen; Guan-Hua Tu; Chi-Yu Li 001; Sihan Wang 002; Jingwen Shi; Tian Xie 001; Li Xiao 001; Chunyi Peng 001; Zhaowei Tan; Songwu Lu (GetMobile Mob. Comput. Commun., 2023)

Insecurity of Operational IMS Call Systems: Vulnerabilities, Attacks, and Countermeasures. - Yu-Han Lu; Sandy Hsin-Yu Hsiao; Chi-Yu Li 001; Yi-Chen Hsieh; Po-Yi Chou; Yao-Yu Li; Tian Xie 001; Guan-Hua Tu (IEEE/ACM Trans. Netw., 2023)

MPKIX: Towards More Accountable and Secure Internet Application Services via Mobile Networked Systems. - Tian Xie 001; Sihan Wang 002; Xinyu Lei; Jingwen Shi; Guan-Hua Tu; Chi-Yu Li 001 (IEEE Trans. Mob. Comput., 2023)

InstaMAuth: Instant Mobile Authentication Service Based on 5G Authenticated Call Sessions. - Yi-Chen Hsieh; Tzu-Chi Yu; Chi-Yu Li 001; Guan-Hua Tu (DSC, 2024)

Uncovering Problematic Designs Hindering Ubiquitous Cellular Emergency Services Access. - Yiwen Hu 002; Min-Yue Chen; Haitian Yan; Chuan-Yi Cheng; Guan-Hua Tu; Chi-Yu Li 001; Tian Xie 001; Chunyi Peng 001; Li Xiao 001; Jiliang Tang (MobiCom, 2024)

Practical Latency-Aware Scheduling for Low-Latency Elephant VR Flows in Wi-Fi Networks. - Shao-Jung Lu; Wei-Xun Chen; Yu-Shao Su; Yu-Shou Chang; Yao-Wen Liu; Chi-Yu Li 001; Guan-Hua Tu (PerCom, 2024)

Dissecting Operational Cellular IoT Service Security: Attacks and Defenses. - Sihan Wang 002; Tian Xie 001; Min-Yue Chen; Guan-Hua Tu; Chi-Yu Li 001; Xinyu Lei; Po-Yi Chou; Fu-Cheng Hsieh; Yiwen Hu 002; Li Xiao 001; Chunyi Peng 001 (IEEE/ACM Trans. Netw., 2024)

Taming the Insecurity of Cellular Emergency Services (9-1-1): From Vulnerabilities to Secure Designs. - Min-Yue Chen; Yiwen Hu 002; Guan-Hua Tu; Chi-Yu Li 001; Sihan Wang 002; Jingwen Shi; Tian Xie 001; Ren-Chieh Hsu; Li Xiao 001; Chunyi Peng 001; Zhaowei Tan; Songwu Lu (IEEE/ACM Trans. Netw., 2024)

IMS is Not That Secure on Your 5G/4G Phones. - Jingwen Shi; Sihan Wang 002; Min-Yue Chen; Yiwen Hu 002; Guan-Hua Tu; Tian Xie 001; Man-Hsin Chen; Chi-Yu Li 001; Chunyi Peng 001 (GetMobile Mob. Comput. Commun., 2025)