• Proposes the first dedicated steganalysis algorithm for 3D point clouds, overcoming the limitation of steganalysis being restricted to 3D mesh objects.
• Introduces a composite operator (improved 3DHarris-ISS) for feature enhancement, highlighting secret-information-bearing points and suppressing vertex interference.
• Develops a new feature set POINT72, combining screened 3D mesh features with newly proposed local neighborhood features, to reduce redundancy and improve detection accuracy.
• Achieves steganalysis accuracy close to existing 3D mesh algorithms despite the absence of edge and face information in point clouds, confirming its practical effectiveness.