Dazu Huang

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The causation that why the capacity of information hiding algorithm based on DCT domain is small is analyzed, a large capacity blind information hiding algorithm based on DCT domain is proposed. First, uniform spectrum processing act on the carrier image, then the image is processed globe DCT transform. Finally, the information, which is to be hidden, is(More)
The reason why only small capacity information can be hidden in DCT domain of image is analyzed, a information hiding algorithm of high capacity for DCT domain is proposed. In our scheme, the uniform spectrum processing is first applied to the original image. Then, a global DCT transformation of the image is finished. Finally, the hidden information is(More)
Improving hiding capacity and resisting compression ability is an important problem in information hiding application. In this paper, invariance of JPEG compression is analyzed firstly. Then, according to invariance of JPEG compression, an information hiding algorithm which can embed information in DCT median and high frequency coefficients is proposed.(More)
An explicit design of a linear dispersive space-time-frequency (STF) code is investigated with a design criterion achieving a high rate for frequency-selective channels when the partial interference cancelation (PIC) group decoding is implemented at receiver. With an appropriate grouping scheme, the proposed STF code is shown to obtain a similar diversity(More)
In our recent paper entitled"Quantum Quasi-Cyclic Low-Density Parity-Check codes"[ICIC 2009. LNCS 5754], it was claimed that some new quantum codes can be constructed via the CSS encoding/decoding approach with various lengths and rates. However, the further investigation shows that the proposed construction may steal some ideas from the paper(More)
Motivated by multi-step quantum teleportation of single-qubit states and two-qubit states with entanglement swapping, we present a small scale quantum network communication scheme based on entanglement of Bell states. In this scheme, it contains certain number of singlequbit quantum source nodes that teleport unknown quantum states to other nodes in the(More)
Based on single photons with random polarization angel, a deterministic secure bidirectional quantum communication scheme, which is similar to traditional communication mode, is proposed. In this scheme both checking messages and secret messages are encoded in the single photons rotated random polarization angle by performing a series of independent(More)