Hongzhen Du

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In this paper, we present a certificateless signature (CLS) scheme that is proved to be secure in the random oracle model under the hardness assumptions of k-CAA and Inv-CDHP. Our scheme upholds all desirable properties of previous CLS schemes, and requires general cryptographic hash functions instead of the MapToPoint hash function which is inefficient and(More)
In this paper, we present a universal forgery attack on Kang et al.'s identity-based strong designated verifier signature (IBSDVS) scheme. We show anyone can forge a valid IBSDVS on an arbitrary message without the knowledge of the private key of either the signer or the designated verifier. Moreover, we point out that Kang et al.'s scheme does not satisfy(More)
In this paper, based on the scheme proposed by Bar-reto et al in ASIACRYPT 2005, an identity-based signcryption scheme in multiple Private Key Generator (PKG) environment is proposed, which mitigates the problems referred to users' private keys escrow and distribution in single PKG system. For security of the scheme, it is proved to satisfy the properties(More)
The molecular regulation of the lung metastasis of pancreatic carcinoma (PCC) is not completely understood. Here, we show that the levels of phosphorylated SMAD3, ZEB1, ZEB2, Snail1, and Snail2 were significantly higher in PCC with lung metastasis than in PCC without lung metastasis. Overexpression of TGFβ1 enhanced the invasiveness of PCC cells, while(More)
OBJECTIVE To study the role of presenilin1 (PS1) in the processing of beta-amyloid precursor protein (APP) to amyloid beta-peptide (Abeta) and its relation to gamma-secretase in the pathogenesis of Alzheimer's disease (AD). METHODS Several CHO cell lines stably transfected with either wide-type or mutant PS1 (M(146)L) along with APP(751) genes were(More)
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