Object-oriented instruction set for resource-constrained...

Details Object-oriented instruction set for resource-constrained... Object-oriented instruction set for resource-constrained...

G - Physics

06

F

G06F 9/45 (2006.01) G06F 9/44 (2006.01) G06F 9/445 (2006.01)

Patent

CA 2361411

A resource-constrained device such as a smart card or the like includes memory for storing an application software program comprising an object-oriented, verifiable, platform-independent, type-safe and pointer-safe sequence of instructions. The device can also include a virtual machine implemented on a microprocessor where the virtual machine is capable of executing the sequence of instructions. Each instruction includes an operation code, and each data manipulation instruction is specific to a particular data type. The application program can be stored on a computer-readable medium prior to being received by the resource-constrained device. Methods of using such an application program, including accessing the program over the Internet and downloading it to a smart card, also are disclosed.

L'invention concerne un dispositif à ressources limitées, tel qu'une carte à puce ou analogue, comprenant une mémoire destinée au stockage d'un logiciel d'application à base d'instructions orientées objet, vérifiables, indépendantes de la plate-forme, et sans description de type ni de pointeur. Ledit dispositif peut également comprendre une machine virtuelle mise en oeuvre sur microprocesseur, ladite machine virtuelle étant capable d'exécuter le jeu d'instructions. Chaque instruction comporte un code OP, chaque instruction de manipulation de données étant spécifique d'un type particulier de données. Le programme d'application peut être stocké sur un support lisible par ordinateur avant sa réception par le dispositif à ressources limitées. L'invention concerne également des procédés d'utilisation de ce logiciel, notamment l'accès au programme via l'Internet et son téléchargement sur une carte à puce.

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