Novel cryptosystem and general framework for digital audio information hiding;

Large capacity information hiding algorithm based on JPEG2000 error-resilient mechanism;

A large capacity information hiding algorithm in binary host image;

Parity-data hiding algorithm based on chaotic random transform;

Lossless audio data hiding algorithm based on difference expansion;

Study of data hiding detection;

Research on steganography application based on RS codes over GF(2~6);

Research on steganography method in pixel domain of color images based on Golay code;

A study of the security of a steganography method and security enhancement methods;

Based on Costa set-up and Cox Gaussian-decomposition for stochastic mixture source,a novel information-hiding communication technology is proposed.

Three typical spatial domain information-hiding algorithms based on LSB,simple Bezier-curve and Quadtree have been investigated respectively in this paper.

The incomplete contracts,asymmetric information and credibility crisis give birth to moral hazard with hidden information and make social efficiency decrease in the construction work.

The opportunism and asymmetric of information, gives birth to hold up, low-investment and moral hazard with hidden information between owner and contractor in the contract variation.