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We test a new four-qubit entangled state by the former Bell-like inequalities and find that it violates these inequalities, but not maximally. According to this entangled state, we build a new Bell-like inequality, which is violated by this new state maximally. We also determine the nonlocality of some other four-qubit states by the new inequality. It is found that the new inequality acts as a strong...
Steganography is an important research direction of information security, which mainly research how to embed secret information into carriers, in order to achieve the objectives of secure communication. In this paper, a novel Chinese text steganography based on substitution of different forms Chinese characters is proposed. We propose two embedding methods named SSM and HESM. SSM simply substitute...
A modified joint source channel decoding (JSCD) algorithm based on low-density parity-check (LDPC) coding and hidden Markov estimation is proposed to employ the self-checking mechanism of LDPC codes in adjusting the error probability p of the hidden Markov model (HMM) and the JSCD scheme utilizes the source residual redundancy while no priori information of the source parameters is available. We also...
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