【摘要】：由于當(dāng)前智能卡應(yīng)用的飛速發(fā)展，對平臺兼容性及運(yùn)行速率的要求不斷提高，因此作為智能卡更新升級版本的Java Card技術(shù)則越來越受到人們的廣泛關(guān)注。而JavaCard系統(tǒng)多是采用軟件虛擬機(jī)的方式來實(shí)現(xiàn)，但是因?yàn)橄到y(tǒng)軟件平臺本身占用了大量的資源，Java Card虛擬機(jī)執(zhí)行效率不高，且不能適應(yīng)有特殊要求的應(yīng)用(如需要快速加解密運(yùn)算)。在深入研究了Java卡系統(tǒng)架構(gòu)，進(jìn)一步分析了影響Java卡性能的主要因素之后，提出對應(yīng)的優(yōu)化措施。本文的成果和創(chuàng)新點(diǎn)如下： 1．由于Java Card內(nèi)部存儲資源都集中在一張卡上，運(yùn)用軟件實(shí)現(xiàn)Java Card虛擬機(jī)將會占用很大的存儲空間，并且降低運(yùn)行效率，而且只適用于普遍的應(yīng)用，因此，我們提出Java Card虛擬機(jī)的性能優(yōu)化方案，目的是提高Java卡對存儲空間的利用率和執(zhí)行APP指令的運(yùn)行速率。 2．從硬件設(shè)計(jì)和信息存儲角度提出Java卡硬件支撐平臺的性能優(yōu)化方案。 3．針對目前市場上Java卡CPU成本較高，，采用通用CPU核，軟件實(shí)現(xiàn)JCRE，在硬件上對現(xiàn)有的Java Card做性能優(yōu)化，采用實(shí)時操作系統(tǒng)來解決Java Card單線程問題，本文提出這種建立在硬件平臺上的優(yōu)化方案，將會大大改善Java Card的執(zhí)行性能，使Java Card的可移植性更強(qiáng)，更適合多應(yīng)用的場景。
[Abstract]:Due to the rapid development of smart card application, the requirement of platform compatibility and running speed is increasing, so the Java Card technology, which is the updated version of smart card, has attracted more and more attention. But the JavaCard system is mostly implemented by the software virtual machine, but because the system software platform itself occupies a lot of resources, the execution efficiency of the, Java Card virtual machine is not high. And can not adapt to special requirements of applications (such as the need for fast encryption and decryption operations). After deeply studying the architecture of Java card system and further analyzing the main factors affecting the performance of Java card, the corresponding optimization measures are put forward. The achievements and innovations of this paper are as follows: 1. Because the internal storage resources of Java Card are concentrated on one card, using software to implement Java Card virtual machine will take up a lot of storage space and reduce the running efficiency. Therefore, we propose a performance optimization scheme for Java Card virtual machines, which aims to improve the utilization of storage space of Java cards and the speed of executing APP instructions. 2. From the point of view of hardware design and information storage, the performance optimization scheme of Java card hardware supporting platform is put forward. 3. In view of the high cost of Java card CPU in the market at present, the general CPU core is used to realize the performance optimization of the existing Java Card by JCRE, in hardware, and the real-time operating system is used to solve the single thread problem of Java Card. This paper proposes an optimization scheme based on hardware platform, which will greatly improve the execution performance of Java Card, make Java Card more portable and more suitable for multi-application scenarios.
【學(xué)位授予單位】：武漢郵電科學(xué)研究院
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2012
【分類號】：TP302

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