Published sealed-bid auction schemes are classi ed into four models according to how they deal with bid privacy. The properties of each model are introduced and possible improvements in these models are suggested. A new model is proposed and its implementation is discussed. Application of di erent models is discussed, based on a comparison of the models.

W H E N the Manhigh capsule system was being designed in the fall of 1955, the pr imary objective was a maximum performance system of minimum weight that could lift a man into a space equivalent environment for twenty-four hours. This objective 'had to be met safely and supply an answer to what the man could :do if any specific componem failed. Beyond this, an effort was made to provide him wit...

We have N = {1, . . . , n} bidders, where each bidder has a private valuation vi drawn from distribution Fi 1 with strictly positive den1 Here, we assume that valuations follow the IPV model. sity, fi : Ti → R>0, for a good up for sale by the auctioneer, agent 0. In a first-price, sealed-bid auction, each agent has a type vi ∈ Ti, and submits a bid bi to the auctioneer, without revealing what t...

Consider a protocol in which Belinda seals a (classical) message. She gives the resulting sealed message to Charlie, who can either unseal and read the message or return it unopened to Belinda. If he returns it unopened, Belinda should be able to verify that Charlie neither read the message nor made a copy that would allow him to read it later. Such a protocol is impossible with classical crypt...

In 2007, Kaiser Permanente's (KP) Southern California Region designed and implemented a systematic in-reach program, the Proactive Office Encounter (POE), to address the growing needs of its three million patients for preventive care and management of chronic disease. The program sought staff from both primary and specialty care departments to proactively identify gaps in care and to assist phy...