Towards Universal Speech Recognition. - Zhirong Wang; Umut Topkara; Tanja Schultz; Alex Waibel (ICMI, 2002)

Natural Language Watermarking and Tamperproofing. - Mikhail J. Atallah; Victor Raskin; Christian Hempelmann; Mercan Karahan; Radu Sion; Umut Topkara; Katrina E. Triezenberg (Information Hiding, 2002)

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 (MM&Sec, 2004)

Have the cake and eat it too - Infusing usability into text-password based authentication systems. - Sundararaman Jeyaraman; Umut Topkara (ACSAC, 2005)

The hiding virtues of ambiguity: quantifiably resilient watermarking of natural language text through synonym substitutions. - Umut Topkara; Mercan Topkara; Mikhail J. Atallah (MM&Sec, 2006)

Attacks on lexical natural language steganography systems. - Cüneyt M. Taskiran; Umut Topkara; Mercan Topkara; Edward J. Delp (Security, Steganography, and Watermarking of Multimedia Contents, 2006)

Inferring functional information from domain co-evolution. - Yohan Kim; Mehmet Koyutürk; Umut Topkara; Ananth Grama; Shankar Subramaniam (Bioinform., 2006)

Pairwise Alignment of Protein Interaction Networks. - Mehmet Koyutürk; Yohan Kim; Umut Topkara; Shankar Subramaniam; Wojciech Szpankowski; Ananth Grama (J. Comput. Biol., 2006)

Passwords decay, words endure: secure and re-usable multiple password mnemonics. - Umut Topkara; Mikhail J. Atallah; Mercan Topkara (SAC, 2007)

Information hiding through errors: a confusing approach. - Mercan Topkara; Umut Topkara; Mikhail J. Atallah (Security, Steganography, and Watermarking of Multimedia Contents, 2007)

Passwords for Everyone: Secure Mnemonic-based Accessible Authentication. - Umut Topkara; Mercan Topkara; Mikhail J. Atallah (USENIX ATC, 2007)

Information security applications of natural language processing techniques - Umut Topkara (2007)

CoCoST: A Computational Cost Efficient Classifier. - Liyun Li; Umut Topkara; Baris Coskun; Nasir D. Memon (ICDM, 2009)

ACE-Cost: Acquisition Cost Efficient Classifier by Hybrid Decision Tree with Local SVM Leaves. - Liyun Li; Umut Topkara; Nasir D. Memon (MLDM, 2011)

Seeing is not believing: visual verifications through liveness analysis using mobile devices. - Mahmudur Rahman; Umut Topkara; Bogdan Carbunar (ACSAC, 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)

SensCrypt: A Secure Protocol for Managing Low Power Fitness Trackers. - Mahmudur Rahman; Bogdan Carbunar; Umut Topkara (ICNP, 2014)

Liveness verifications for citizen journalism videos. - Mahmudur Rahman; Mozhgan Azimpourkivi; Umut Topkara; Bogdan Carbunar (WISEC, 2015)

Enabling Multiple QR Codes in Close Proximity. - Mercan Topkara; Thomas Erickson; Umut Topkara; Chandrasekhar Narayanaswami 001 (CoRR, 2015)

Secure Management of Low Power Fitness Trackers. - Mahmudur Rahman; Bogdan Carbunar; Umut Topkara (IEEE Trans. Mob. Comput., 2016)

Movee: Video Liveness Verification for Mobile Devices Using Built-In Motion Sensors. - Mahmudur Rahman; Umut Topkara; Bogdan Carbunar (IEEE Trans. Mob. Comput., 2016)

A Secure Mobile Authentication Alternative to Biometrics. - Mozhgan Azimpourkivi; Umut Topkara; Bogdan Carbunar (ACSAC, 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)

Video Liveness for Citizen Journalism: Attacks and Defenses. - Mahmudur Rahman; Mozhgan Azimpourkivi; Umut Topkara; Bogdan Carbunar (IEEE Trans. Mob. Comput., 2017)

Human Distinguishable Visual Key Fingerprints. - Mozhgan Azimpourkivi; Umut Topkara; Bogdan Carbunar (USENIX Security Symposium, 2020)