What's the difference between a javacardos and JCVM

[tianya]

What's the difference between a javacardos and JCVM?

[tay00000]

If you are talking about the technology, the JavaCard is a bundle of technologies based on Java and promoted by Oracle and created by Sun Microsystem under the Java family of products.

It uses Java-like syntax for programming and uses a subset of the Java language and JVM bytecodes and technologies.

A JavaCard OS (JCOS) is simply an Operating System for a type of programmable smart card based on the Sun/Oracle JavaCard techologies and is simply a type of OS that follows the JavaCard standards and specifications.

The JCVM is an important component within the JavaCard as a module running as part of the JavaCard Operating System package whose ability is to convert bytecodes from Java classes for execution on the JCOS with the use of a shrunken down Java Virtual Machine for the JavaCard type of smart cards via the name of a JavaCard Virtual Machine. It uses similar technologies as a normal JVM but it is tuned for JavaCard smart card environments that require lesser memory for operations and storage as well as a need for high security applications (i.e. cryptography and authentication purposes).