  Three-dimensional (3-D) meshes are commonly used to represent virtual
surfaces and volumes. Over the past decade, 3-D meshes have emerged in
industrial, medical, and entertainment applications, being of large practical
significance for 3-D mesh steganography and steganalysis. In this article, we
provide a systematic survey of the literature on 3-D mesh steganography and
steganalysis. Compared with an earlier survey [1], we propose a new taxonomy of
steganographic algorithms with four categories: 1) two-state domain, 2) LSB
domain, 3) permutation domain, and 4) transform domain. Regarding steganalysis
algorithms, we divide them into two categories: 1) universal steganalysis and
2) specific steganalysis. For each category, the history of technical
developments and the current technological level are introduced and discussed.
Finally, we highlight some promising future research directions and challenges
in improving the performance of 3-D mesh steganography and steganalysis.
