We present a bandwidth-efficient off-line anonymous e-cash scheme with traceable coins. Once a user double-spends, his identity can be revealed and all his coins in the system can be traced, without resorting to TTP. For a security level comparable with 1024-bit standard RSA signature, the payment transcript size is only 512 bytes. Security of the proposed scheme is proven under the q-strong Di...

Treasury bonds provide money-like services, while other bonds do not. These money-like services, which include safety and liquidity, are valued more during financial crises, reducing the substitutability of actual Treasuries and synthetic Treasuries—other types of bonds that yield the same cash flows. Large equilibrium yield spreads between actual and synthetic Treasuries result. During the rec...

Given a set of n coins, some of them weighing H, the others weighing h, h < H, we prove that to determine the set of heavy coins, an optimal algorithm requires an average of 1+ρ 1+ρ+ρ n + O(1) comparisons, using a beam balance, in which ρ denotes the ratio of the probabilities of being light and heavy. A simple quasi-optimal algorithm is described. Similar results are derived for the majority p...

Neural networks have been used in the development of intelligent systems that simulate pattern recognition and object identification. Coin identification by machines relies currently on the assessment of the physical parameters of a coin. An intelligent coin identification system that uses coin patterns for identification helps preventing confusion between different coins of similar physical di...

We present the first fair e-cash system with a compact wallet that enables users to spend efficiently k coins while only sending to the merchant O(λ log k) bits, where λ is a security parameter. The best previously known schemes require to transmit data of size at least linear in the number of spent coins. This result is achieved thanks to a new way to use the Batch RSA technique and a tree-bas...

Coins are the vital part of our life. It is used at every point whether it is small cafe or in mall. So it’s our fundamental need to recognize the coins. Image Processing is a field in which working is done on images. By using this, recognition of different denomination of coins is done. For recognition, first canny edge detection is used to detect edges then Hough Transformation is used to det...

This paper presents Treasure, an outdoor mobile multiplayer game inspired by Weiser’s notion of seams, gaps and breaks in different media. Playing Treasure involves movement in and out of a wi-fi network, using PDAs to pick up virtual ‘coins’ that may be scattered outside network coverage. Coins have to be uploaded to a server to gain game points, and players can collaborate with teammates to d...