We propose a non-divisible electronic cash system that combines the restrictive blind signature technique and a batch signature scheme based upon the binary tree structure. Contemporary electronic cash solutions rely on the divisibility paradigm to achieve significant computational savings, and such techniques are considered to be the most efficient. We demonstrate an alternative approach that ...

An off-line electronic cash scheme is proposed that is suitable for small payments. The approach is innovative, in that each coin may be efficiently verified by the same or different merchants during payment. The scheme relies on a batch signature technique to efficiently sign and verify individually spent coins; coins may also be deposited in batch manner. The scheme outlined differs considera...

Energy dispersive X-ray Fluorescence technique has been used to study five rupee indian coins of years 1992,1993,1994,1999,2009,2010,2011 and 2012 for their material/ elemental compositions. EDX-720 spectrometer provided with X-ray tube and Si(Li) detector having energy resolution 165 eV at 5.9KeV Mn K X-ray. Different metal compositions like Cupro-Nickel, NickelBrass and Ferritic Stainless-Ste...

The competency to detect and to recognize the different denomination of coins is an essential expertise in the human beings life. This paper represents different algorithms for the detection and the recognition of coins which are highly overlapped. The proposed system includes three principal steps detection, extraction and recognition. This system is efficient in detecting and recognizing the ...

In this paper we describe the pattern recognition methods used for the identification of coins in the new coin recognition and sorting system Dagobert developed at the ARC Seibersdorf research centre. The purpose of Dagobert is to sort high volumes of coins. In particular the coin detection task, the features used to pre-select meaningful potential master coins for the verification process and ...

We introduce a new family of one-player games, involving the movement of coins from one configuration to another. Moves are restricted so that a coin can be placed only in a position that is adjacent to at least two other coins. The goal of this paper is to specify exactly which of these games are solvable. By introducing the notion of a constant number of extra coins, we give tight theorems ch...

Drawings from memory of a penny, nickel, dime, and quarter were obtained from 125 undergraduates. The modal recalls for the heads of all four coins were identical, suggesting that a schema for coins exists. In an attempt to have the schema produced directly, another 75 students designed either a 2-, 7-, or 20-cent piece that would fit into our present currency. The modal drawing for this task w...

This paper addresses the 3D acquisition of historical coins and evaluates its benefits over the current documentation method by means of 2D images. We present preliminary results on creating full 3D models of coins from the Roman and medieval times using a state-of-the-art active stereo scanning device. Furthermore, we discuss the results from numismatic point of view and highlight the differen...

This paper addresses a popular topic in science teaching and competitions for primary secondary school students. Experiments with colliding coins are relatively easy to perform therefore lessons. We used the idea competition we organized pupils aged 6 13 years. The is based on few experiments that participants have carry out before competition. Some years ago, 10- 11-year-old had experiment coi...