Blakley, Blakley, Chan and Massey conjectured a lower bound on the entropy of broadcast messages in threshold schemes with disenrollment. In an effort to examine the conjecture, we identify their original scheme definition has a limitation: a coalition of participants can reconstruct all shared secrets without broadcast from the dealer, and hence render the dealer no control over disenrollment....

Smart card has been adopted to various applications. In 2000, Hwang and Li proposed a remote user authentication scheme, which is also using smart card. Nine months later, Chan and Cheng pointed out that there is a weakness in the remote authentication scheme proposed by Hwang and Li. In this paper, we show that Chan and Cheng’s attack does not work well because they did not consider the format...

Proposed work is aimed at finding a method to estimate a scaling parameter λ because of which minor object irregularities in the target texture image are ignored by the level set function during the process of curve evolution. Here the texture segmentation is achieved by embedding the statistical moment features in to the Level set frame work implemented as per Chan – Vese approach. The scaling...

Blakley, Blakley, Chan and Massey conjectured a lower bound on the entropy of public broadcast in a threshold scheme with disenrollment capability. In this paper, we first show that the conjecture need not be true in general. Then we establish a tight lower bound on the entropy of public information by introducing one property to the definition of threshold schemes with disenrollment. We also p...

An over-the-counter Chinese medicine, Chan Su, is used as a cardiotonic agent. We demonstrated significant digoxin-like immunoreactivity in various organic and aqueous extracts of Chan Su. For example, when a 20-microL aliquot of an aqueous extract of Chan Su powder (1 mg/mL) was added to a 2-mL aliquot of a drug-free serum, the observed digoxin-like immunoreactivity was 2.76 ng/mL (3.53 nmol/L...