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– Hwang and Li proposed the first remote user authentication scheme using smart cards to solve the problems of Lamport scheme. Unfortunately, Hwang and Li's scheme has some security weaknesses. First, Chan-Chang, Shen-Lin-Hwang and then Chang-Hwang pointed out some attacks on Hwang – Li's scheme. This paper presents a new remote user authentication scheme… (More)
Blind signature is the concept to ensure anonymity of e-coins. Untracebility and unlinkability are two main properties of real coins, which require mimicking electronically. Whenever a user is permitted to spend an e-coin, he is in need to fulfill above requirements of blind signature. This paper proposes a proxy blind signature scheme with which a proxy is… (More)
In this paper we proposed two identification schemes based on the root problem. The proposed schemes are secure against passive attacks assuming that the root problem (RP) is hard in braid groups.
This paper presents a directed signature scheme with the property that the signature can be verified only with the help of signer or signature receiver. We also propose its applications to share verification of signatures and to threshold cryptosystems.
Blind signature schemes enable a useful protocol that guarantee the anonymity of the participants while Signcryption offers authentication of message and confidentiality of messages at the same time and more efficiently. In this paper, we present a blind signcryption scheme that combines the functionality of blind signature and signcryption. This blind… (More)
User authentication technologies that provide the anonymity of users have been proposed according to increase in the need for security of personal information and privacy protection in ubiquitous computing environments. Studies on smart card-based authentication systems have been actively conducted. In 1993, Chang and Wu first proposed a smart card-based… (More)
We describe a renal transplant patient who developed hypercalcemia during treatment with ganciclovir for cytomegaloviral (CMV) infection. To our knowledge such an association has not previously been reported. Hypercalcemia was associated with low levels of serum parathormone (PTH) and an increase in 1,25 dihydroxy vitamin D concentrations. The mechanism(s)… (More)
We describe a patient with idiopathic membranous glomerulopathy who developed acute deterioration in renal function; this was associated with hemoptysis, severe hypertension, and anti-glomerular basement membrane (anti-GBM) antibody in the serum. Despite aggressive therapy with plasmapheresis, cyclophosphamide and prednisone, the patient progressed to… (More)
This report describes a patient on continuous ambulatory peritoneal dialysis (CAPD) who developed acute pancreatitis with pseudocyst formation and cloudy dialysate with pleocytosis in the absence of bacterial or fungal organisms. To our knowledge, pancreatitis, in the absence of hypertriglyceridemia in a CAPD patient, has not been previously reported. There… (More)
The effect of strict blood pressure control on progression of renal disease in patients with essential hypertension has not been well defined. We have followed prospectively for three years 23 patients with essential hypertension. Blood pressure was well controlled on either enalapril or enalapril-hydrochlorothiazide therapy. Yearly assessment of renal… (More)