For audio content security, such as audio content protection, as well as speech tampering detection, audio information hiding (AIH) techniques are attracting considerable attention. Ten years have passed since our research group started attempring to resolve many issues in AIH projects. In this paper, we introduce the basis of AIH, important knowledge of human hearing characteristics effective in realigning AIH, and typical methods of AIH. Then, AIH methods based on cochlear delay characteristics, based on adaptive phase modulation, and singular spectrum analysis proposed by the anthor's research group are also introduced. In addition, we present the research topic of speech tampering detection for secure speech communications, which is one of the current issues in speech technology.
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