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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 an ID-based signature scheme that is proved to be secure in the random oracle model under the hardness assumption of k-CAA problem. The proposed scheme upholds all desirable properties of previous IBS schemes, and requires general cryptographic hash functions instead of MapToPoint hash function that 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 Barreto 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 of(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 evaluate whether Vitamin B supplementation could prevent ischemic stroke recurrence. METHODS Randomized controlled trials (RCTs) observing Vitamin B supplementation in patients with stroke was performed in databases including ScienceDirect, PubMed/Medline, China National Knowledge Infrastructure, Chinese Biomedical Data-Base, Wanfang(More)
Nutrition screening to identify patients at risk of malnutrition is vital for cancer patients because of the high prevalence of malnutrition in this population. The aim of the present study was to compare different methods of nutrition assessment in patients with tumors. From June 2013 to June 2014, we conducted an observational multicenter study to compare(More)