Abstract: This application note describes how monetary value can be represented and stored in iButton® data carriers (tokens). The document defines a digital certificate called a "Maxim Digital Monetary Certificate" (a.k.a., "eCertificate"), and describes the certificate's various components. It suggests use of the eCertificate for electronic monetary transaction systems, such as vending, fare collection, tollbooths, meter reading, bill changer systems, etc. Maxim > App Notes > 1-Wire Devices Keywords: digital certificates, SHA-1, mac, challenge, response, monetary, ecash, e-cash, monetary, Mar 08, 2002 certificate, certificates, eCertificate, authentication, vending, fare, tollbooths, meters, bill changers, DS1963S APPLICATION NOTE 151 Maxim Digital Monetary Certificates Abstract: This application note describes how monetary value can be represented and stored in iButton data carriers (tokens). The document defines a digital certificate called a "Maxim Digital Monetary Certificate" (a.k. a., "eCertificate"), and describes the certificate's various components. It suggests use of the eCertificate for electronic monetary transaction systems, such as vending, fare collection, tollbooths, meter reading, bill changer systems, et……