Implementation of Java Card Virtual Machine

Java card is a new system for programming smart cards, which is based on the Java language and Virtual Machine. Java card programs (applets) run in Java Card Runtime Environment (JCRE) including the Java Card Virtual Machine (JCVM), the framework, the associated native methods and the API (Ap plication Programming Interface). JCVM is implemented as two separate pieces: off-card VM (Virtual Machine) and on-card VM. The stack model and heap memory structure used by on-card VM and exception handling are introduced. Because there airs limited resources within smart card environment, and garbage collection is not supported in JCVM, the preferred way to exception handling does not directly involve the use of throw, although the throw keyword is supported. Security is the most important feature of smart card. The Java card applet security feature is also discussed.

Java卡平台安全性研究与应用

介绍了Java卡的结构,从Java语言的安全性、Java卡平台安全性的提高和分离式的虚拟机结构3个方面详细论述了Java卡平台的安全性。通过一个Java卡平台金融支付系统的安全机制,着重介绍了基于Java卡平台的上层应用软件的安全性设计。

Java卡的研究与实现

Java卡是一种新的智能卡 ,它基于 Java语言和虚拟机。 Java卡应用程序 (applet)可以运行于 Java卡运行环境—— JCRE(Java Card Runtime Environment)中 ,JCRE包含 Java卡虚拟机—— JCVM(Java Card Virtual Machine)、核心 API类库和相关的本地方法。JCVM由两部分组成 :卡外虚拟机和卡内虚拟机。主要介绍了卡内虚拟机的解释执行、异常处理、堆栈模型以及堆的存储器组织。

Java卡关键技术的研究及实现

根据最新Java卡规范,对Java卡的关键技术进行了深入研究和分析,提供了Java卡系统在AT90SC智能卡上的一种具体实施。详细描述了Java卡实施所采用的系统构架和工作流程,深入分析Java卡虚拟机和API等关键技术,并讨论了为提高Java卡虚拟机执行效率所采取的策略。测试结果表明,该Java卡系统能够正确高效地解释及执行Java卡应用程序。