Audio CoFIP (Contents Fingerprinting) Robust Against Collusion Attack. - Kotaro Sonoda; Ryouichi Nishimura; Yôiti Suzuki (KES (2), 2005)

Information Hiding for Public Address Audio Signal using FH/FSK Spread-spectrum Scheme. - Kotaro Sonoda; Katsunari Yoshioka; Osamu Takizawa (IIH-MSP, 2007)

Information Hiding on Lossless Data Compression. - Katsunari Yoshioka; Kotaro Sonoda; Osamu Takizawa; Tsutomu Matsumoto (J. Digit. Inf. Manag., 2008)

User Authentication Scheme Using Individual Auditory Pop-Out. - Kotaro Sonoda; Osamu Takizawa (New Directions in Intelligent Interactive Multimedia, 2008)

A Proposal of Malware Distinction Method Based on Scan Patterns Using Spectrum Analysis. - Masashi Eto; Kotaro Sonoda; Daisuke Inoue; Katsunari Yoshioka; Koji Nakao (ICONIP (2), 2009)

Audio Watermarking Using QIM on Wavelet Packet Coefficients. - Kotaro Sonoda; Osamu Takizawa (IIH-MSP, 2009)

Fine-Grain Feature Extraction from Malware's Scan Behavior Based on Spectrum Analysis. - Masashi Eto; Kotaro Sonoda; Daisuke Inoue; Katsunari Yoshioka; Koji Nakao (IEICE Trans. Inf. Syst., 2010)

Digital Watermarking Method Based on STFT Histogram. - Kotaro Sonoda; Aleksander Sek (IIH-MSP, 2013)

Audible Secret Keying for Time-Spread-Echo Based Audio Watermarking. - Tatsuya Matsumoto; Kotaro Sonoda (IIH-MSP, 2015)

Tally Based Digital Audio Watermarking. - Kotaro Sonoda; Shu Noguchi (IIH-MSP (1), 2017)