Umut Topkara

According to our database, Umut Topkara authored at least 24 papers between 2002 and 2020.

Collaborative distances:

• Dijkstra number of three.
• Erdős number of three.

2020

Human Distinguishable Visual Key Fingerprints.

Mozhgan Azimpourkivi, Umut Topkara, Bogdan Carbunar

Proceedings of the 29th USENIX Security Symposium, 2020

2017

Video Liveness for Citizen Journalism: Attacks and Defenses.

Mahmudur Rahman, Mozhgan Azimpourkivi, Umut Topkara, Bogdan Carbunar

IEEE Trans. Mob. Comput., 2017

Camera Based Two Factor Authentication Through Mobile and Wearable Devices.

Mozhgan Azimpourkivi, Umut Topkara, Bogdan Carbunar

Proc. ACM Interact. Mob. Wearable Ubiquitous Technol., 2017

A Secure Mobile Authentication Alternative to Biometrics.

Mozhgan Azimpourkivi, Umut Topkara, Bogdan Carbunar

Proceedings of the 33rd Annual Computer Security Applications Conference, 2017

2016

Movee: Video Liveness Verification for Mobile Devices Using Built-In Motion Sensors.

Mahmudur Rahman, Umut Topkara, Bogdan Carbunar

IEEE Trans. Mob. Comput., 2016

Secure Management of Low Power Fitness Trackers.

Mahmudur Rahman, Bogdan Carbunar, Umut Topkara

IEEE Trans. Mob. Comput., 2016

2015

Enabling Multiple QR Codes in Close Proximity.

Mercan Topkara, Thomas Erickson, Umut Topkara, Chandrasekhar Narayanaswami

CoRR, 2015

Liveness verifications for citizen journalism videos.

Mahmudur Rahman, Mozhgan Azimpourkivi, Umut Topkara, Bogdan Carbunar

Proceedings of the 8th ACM Conference on Security & Privacy in Wireless and Mobile Networks, 2015

2014

SensCrypt: A Secure Protocol for Managing Low Power Fitness Trackers.

Mahmudur Rahman, Bogdan Carbunar, Umut Topkara

Proceedings of the 22nd IEEE International Conference on Network Protocols, 2014

2013

Runtime adaptive multi-factor authentication for mobile devices.

Paul C. Castro, Joe W. Ligman, Marco Pistoia, John Ponzo, Gegi Thomas, Umut Topkara

IBM J. Res. Dev., 2013

Seeing is not believing: visual verifications through liveness analysis using mobile devices.

Mahmudur Rahman, Umut Topkara, Bogdan Carbunar

Proceedings of the Annual Computer Security Applications Conference, 2013

2011

ACE-Cost: Acquisition Cost Efficient Classifier by Hybrid Decision Tree with Local SVM Leaves.

Liyun Li, Umut Topkara, Nasir D. Memon

Proceedings of the Machine Learning and Data Mining in Pattern Recognition, 2011

2009

CoCoST: A Computational Cost Efficient Classifier.

Liyun Li, Umut Topkara, Baris Coskun, Nasir D. Memon

Proceedings of the ICDM 2009, 2009

2007

Passwords for Everyone: Secure Mnemonic-based Accessible Authentication.

Umut Topkara, Mercan Topkara, Mikhail J. Atallah

Proceedings of the 2007 USENIX Annual Technical Conference, 2007

Information hiding through errors: a confusing approach.

Mercan Topkara, Umut Topkara, Mikhail J. Atallah

Proceedings of the Security, Steganography, and Watermarking of Multimedia Contents IX, 2007

Passwords decay, words endure: secure and re-usable multiple password mnemonics.

Umut Topkara, Mikhail J. Atallah, Mercan Topkara

Proceedings of the 2007 ACM Symposium on Applied Computing (SAC), 2007

2006

Pairwise Alignment of Protein Interaction Networks.

Mehmet Koyutürk, Yohan Kim, Umut Topkara, Shankar Subramaniam, Wojciech Szpankowski, Ananth Grama

J. Comput. Biol., 2006

Inferring functional information from domain co-evolution.

Yohan Kim, Mehmet Koyutürk, Umut Topkara, Ananth Grama, Shankar Subramaniam

Bioinform., 2006

Attacks on lexical natural language steganography systems.

Cüneyt M. Taskiran, Umut Topkara, Mercan Topkara, Edward J. Delp

Proceedings of the Security, Steganography, and Watermarking of Multimedia Contents VIII, 2006

The hiding virtues of ambiguity: quantifiably resilient watermarking of natural language text through synonym substitutions.

Umut Topkara, Mercan Topkara, Mikhail J. Atallah

Proceedings of the 8th workshop on Multimedia & Security, 2006

2005

Have the cake and eat it too - Infusing usability into text-password based authentication systems.

Sundararaman Jeyaraman, Umut Topkara

Proceedings of the 21st Annual Computer Security Applications Conference (ACSAC 2005), 2005

2004

A hierarchical protocol for increasing the stealthiness of steganographic methods.

Mercan Topkara, Umut Topkara, Mikhail J. Atallah, Cüneyt M. Taskiran, Eugene T. Lin, Edward J. Delp

Proceedings of the 6th workshop on Multimedia & Security, 2004

2002

Natural Language Watermarking and Tamperproofing.

Mikhail J. Atallah, Victor Raskin, Christian Hempelmann, Mercan Karahan, Radu Sion, Umut Topkara, Katrina E. Triezenberg

Proceedings of the Information Hiding, 5th International Workshop, 2002

Towards Universal Speech Recognition.

Zhirong Wang, Umut Topkara, Tanja Schultz, Alex Waibel

Proceedings of the 4th IEEE International Conference on Multimodal Interfaces (ICMI 2002), 2002