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JavaCard FAQ Home Page

FAQ Manager is guru Julien SIMON.

Java Card is a software standard dealing with the execution of Java code on processor cards (a.k.a. smart cards). This FAQ deals with issues raised by the Java Card standard: specifications, API, tools, etc. It also covers related topics such as card security, cryptography and content management with Open Platform.

What's New

What's new in Java Card 2.2 ?
JavaCard
Julien SIMON, Jul 30, 2002
Java Card 2.2 has gone public in June 2002. A number of new features have been added, such as: Java Card RMI (Remote Method Invocation), which is a...

What is GSM?
JavaCard, J2ME:Wireless
Bill Day PREMIUM, Sep 30, 2001
Global System for Mobile (GSM) encompases a set of second generation (2G) cellular standards for digitally encoding and transmitting voice over mobile...

Does Java Card support biometrics?
JavaCard:Security
Julien SIMON, Aug 10, 2001
No. As of version 2.1.1, Java Card doesn't provide any API for biometrics.

Are there any Java Card processors?
JavaCard:Smart cards
Julien SIMON, Aug 10, 2001
Yes. Several smart card CPUs are able to run Java Card bytecode directly. Here are the ones we know of: SmartJ ST22 - ST Micro. Jsmart - Nazomi. ...

Can a midlet talk to a Java Card applet?
J2ME:Specs:Profiles:MIDP, JavaCard:Communication
Julien SIMON, Aug 10, 2001
No. Currently, the MID profile doesn't provide any API that would let a midlet talk to a Java Card applet run on the SIM card. It's really a shame,...

Are nested transactions supported?
JavaCard:Transactions
Julien SIMON, Aug 10, 2001
No. Because of the limited resources of current smart cards, Java Card 2.1.1 only supports one transaction level. If you call JCSystem.beginTransaction()...

What is the scope of a transaction?
JavaCard:Transactions
Julien SIMON, Aug 10, 2001
Only a successful call to JCSystem.commitTransaction() will commit a transaction. If a transaction is not explicitly committed, it will abort at the...

Where can I find research papers on Java Card?
JavaCard:Documentation
Julien SIMON, Aug 9, 2001
There are a few places where you may find research papers on Java Card: The ResearchIndex scientific library: just look for "java card" and see what...

How does Java Card protect itself against SPA, DPA, etc?
JavaCard:Security, JavaCard:Cryptography
Julien SIMON, Aug 8, 2001
The Java Card specification doesn't deal with smart card attacks. Card issuers have to make sure that their Java Card implementation is immune (or at least...

Are transient writes transactioned?
JavaCard:Security:Transient data, JavaCard:Transactions
Julien SIMON, Aug 8, 2001
No. Transient data is lost whenever the card is powered-up, so it wouldn't make sense to include it in transactions.

How large can a transaction be?
JavaCard:Transactions
Julien SIMON, Aug 8, 2001
This is platform dependent. You may use JCSystem.getMaxCommitCapacity() to find out what this amount is. Because of overhead, the size of the transaction...

When do I need to use transactions?
JavaCard:Transactions
Julien SIMON, Aug 8, 2001
You need to use transactions anytime you're modifying a set of data, which could end up in a weird state if the modifications don't run to completion. For...

What is a transaction?
JavaCard:Transactions
Julien SIMON, Aug 8, 2001
A transaction is a set of modifications performed atomically, which means that either all modifications are performed or none are performed. This is p...

Please explain "mask", "hard mask", "soft mask"
JavaCard:Smart cards
Julien SIMON, Aug 8, 2001
In the smart card context, the mask is the software that is burned in ROM by the chip manufacturer. This will include the runtime environment and the default...

What is the life cycle of a smart card?
JavaCard:Smart cards
Julien SIMON, Aug 8, 2001
The card issuer (Schlumberger, Gemplus, Oberthur Card Systems, etc) writes the runtime environment and sends it to the chip manufacturer. The chip manufacturer...

What are the main smart card applications?
JavaCard:Smart cards
Julien SIMON, Aug 8, 2001
Chances are you have currently at least one smart card in your pocket right now! The main fields where smart cards are used are banking, mobile telephony...

What is a smart card?
JavaCard:Smart cards
Julien SIMON, Aug 8, 2001
Cards come in two flavors: memory cards and processor cards. Memory cards have no CPU and thus have no processing power: they are just used to store data....

May transient data be shared?
JavaCard:Security:Object sharing, JavaCard:Security:Transient data
Julien SIMON, Aug 8, 2001
No. Any attempt to share a transient array, whatever its type is, will trigger a SecurityException.

How much transient data can I allocate?
JavaCard:Security:Transient data
Julien SIMON, Aug 8, 2001
Not much. The value is platform-dependent, but it's usually around 220 bytes. Transient space is shared among all applets, so you need to be very conservative....

When do I need to use transients?
JavaCard:Security:Transient data
Julien SIMON, Aug 8, 2001
Transients are relevant when you need to store data that mustn't survive either applet deselection or card reset. They're also good for frequently modified...

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