Our Online Store have the new products: RFID antenna board. Currently it can work with JC10M24R and JCOP4 card chips.
Compared with normal cards, the antenna board module has a smaller size and fixed holes, which is easy to integrate in the IOT(Internet Of Things) project.

Search found 18 matches

by roundtable
Sun May 22, 2022 3:05 am
Forum: Questions & Answers
Topic: Generate .cap file
Replies: 1
Views: 1076

Re: Generate .cap file

delete all files in ./bin folder.
by roundtable
Sun May 22, 2022 3:03 am
Forum: Questions & Answers
Topic: GP init update failed. recv: 67 00
Replies: 1
Views: 877

Re: GP init update failed. recv: 67 00

Please check if your card is a javacard,
a simple way, send following commands:
00 a4 04 00
00 ca 00 66
the first is selecting card manager, the other one is get CARD data, if 6A88 is returned, it can be sure that the card is not javacard.
by roundtable
Fri May 20, 2022 8:20 am
Forum: Questions & Answers
Topic: Customize JavaCard ATR
Replies: 1
Views: 1281

Re: Customize JavaCard ATR

Yes, it is impossible to change ATR of javacard if you don't have its reference manual.
by roundtable
Fri May 20, 2022 8:16 am
Forum: Questions & Answers
Topic: Installing applet with pyApduTool giving error 69 85
Replies: 1
Views: 743

Re: Installing applet with pyApduTool giving error 69 85

There are many causes, you could check install / construction method of your applet:
1. if too many clear on deselect/reset memory were allocated
2. if some Key/Cipher/Signature, were initialized, that are not supported by card.
by roundtable
Mon May 21, 2018 4:12 am
Forum: Questions & Answers
Topic: PIN_TRY_COUNTER
Replies: 5
Views: 6853

Re: PIN_TRY_COUNTER

please read documemt of javacard API: javacard.framework.OwnerPIN to decrease try count, just call check(..) with wrong PIN, follwoing is fragment of method check (): ublic boolean check(byte[] pin, short offset, byte length) throws ArrayIndexOutOfBoundsException, NullPointerException Compares pin a...
by roundtable
Tue May 15, 2018 8:34 am
Forum: Applets Development Guide
Topic: Encryption using secure element/domain keys
Replies: 1
Views: 10557

Re: Encryption using secure element/domain keys

Yes, you may misunderstand the purpose of key-enc (DEK key), which is used to establish secure Communication channel between SE and external entity to loading or personalizing application instead of general purpose cipher. If you want to use SE to encrypt or decrypt data for you, you should write yo...
by roundtable
Tue May 15, 2018 8:25 am
Forum: Questions & Answers
Topic: Want to know how unwrap send command works.
Replies: 3
Views: 5716

Re: Want to know how unwrap send command works.

The PUT Key command shall run on established secure channel, so you applet must proess the 'initialize update ' and 'external authenticate' commands first just like below : switch (ins) case INITIALIZE_UPDATE: apdu.setOutgoingAndSend((short) 5, GPSystem.getSecureChannel().processSecurity(apdu)); bre...
by roundtable
Tue May 15, 2018 2:08 am
Forum: Questions & Answers
Topic: How to calculate baud rate OR speed of CARD from ETU and ATR ?
Replies: 3
Views: 7380

Re: How to calculate baud rate OR speed of CARD from ETU and ATR ?

HI, you can refer below table: frequency was set to 3.571200 MHz +--------+----------+--------+------------+----------------+-----------------+-----------------+ | TA1 | Fi | Di | f(max) MHz | periods of ETU | duration of ETU | Baud rate | +========+==========+========+============+================+...
by roundtable
Wed Apr 18, 2018 10:14 pm
Forum: Questions & Answers
Topic: Multiply big numbers
Replies: 8
Views: 11416

Re: Multiply big numbers

You should know something important about javacard: 1. javacard is the mini subset of standard Java, so most of features, packages and classes are not supported in javacard. For example , class BigInterger, it is only available on standard Java (JDK) , if you use it on javacad, you can't build it su...
by roundtable
Wed Apr 18, 2018 5:00 am
Forum: Questions & Answers
Topic: Multiply big numbers
Replies: 8
Views: 11416

Re: Multiply big numbers

HI, guy, are you sure your javacard provide those special API for big integer modular arithmetic ? the standard javacard API can't support your requirements. you may need special javacard equipped with non-standard API to support big integer operation, such as modular add/sub/multiply/GCD and so on....
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