Hitoshi KIYA and Masaaki FUJIYOSHI, "Signal and Image Processing in the Encrypted Domain," ECTI Transactions on Computer Engineering, Computer and Information Technology, vol.6, no.1, pp.11–18, May 2012 (invited paper).
Masaaki Fujiyoshi and Hitoshi Kiya, "Reversible Information Hiding and Its Application to Image Authentication," Multimedia Information Hiding Technologies and Methodologies for Controlling Data, K. Kondo ed., IGI Global, October 2012.
Shen Chuan LIU, Masaaki FUJIYOSHI, and Hitoshi KIYA, "A Use of Magnitude-Only Images for Privacy- and Copyright-Protected Image Trading Systems," Technical Report of IEICE, vol.112, no.190, (no.EMM2012-46), pp.63–68, 28th August, 2012.
Masaaki FUJIYOSHI and Hitoshi KIYA, "A Visually-Lossless Data Hiding Method Based on Histogram Modification," Proc. IEEE International Symposium on Circuits and Systems, no.B5P-R.1, pp.1692–1695, Seoul, Korea, 22nd May, 2012.
Shen Chuan LIU, Masaaki FUJIYOSHI, and Hitoshi KIYA, "A Commutative Scheme of Perceptual Cryptography and Image Compression for JPEG 2000," Proc. International Technical Conference on Circuits/Systems, Computers and Communications, no.E-W1-04, Sapporo, Japan, 18th July, 2012.
Masaaki FUJIYOSHI, "A Histogram Shifting-Based Blind Reversible Data Hiding Method with a Histogram Peak Estimator," Proc. IEEE International Symposium on Communications and Information Technologies, no.W4A-5, pp.318–323, Gold Coast, QLD, Australia, 3rd October, 2012.
Wannida SAE-TANG, Mika SUGIYAMA, Masaaki FUJIYOSHI, and Hitoshi KIYA, "Non-Separable Weighted Median-Cut Quantization for Images with Sparse Color Histogram," Proc. IEEE International Symposium on Intelligent Signal Processing and Communication Systems, no.D2.5, pp.473–478, New Taipei City, Taiwan, R.O.C., 6th November, 2012.
Masaaki FUJIYOSHI and Hitoshi KIYA, "Generalized Histogram Shifting-Based Reversible Data Hiding with an Adaptive Binary-to-q-ary Converter," Proc. APSIPA Annual Summit and Conference, no.PS.6-IVM.19-2, Los Angeles, CA, the U.S., 6th December, 2012.
Wannida SAE-TANG, Masaaki FUJIYOSHI, Hiroyuki KOBAYASHI, and Hitoshi KIYA, "Intensity Range Reduction for Amplitude-Only Images," Proc. International Workshop on Advanced Image Technology, no.5A-1, pp.322–327, Nagoya，Japan, 8th January, 2013.
Yuichi MURAKI, Masaaki FUJIYOSHI, and Hitoshi KIYA, "A Decryption-Free Secure Face Recognition System," Proc. International Workshop on Advanced Image Technology, no.SPS-3, p.780, Nagoya，Japan, 8th January, 2013.