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by Riddle
Wed Apr 18, 2018 5:39 am
Forum: Questions & Answers
Topic: Multiply big numbers
Replies: 8
Views: 23064

Re: Multiply big numbers

What format do you used? decimal or hexadecimal? The big number is modular multiplication algorithm, the decimal and hexadecimal are not the same, but the hexadecimal is easier.
by Riddle
Mon Jun 26, 2017 3:11 am
Forum: Questions & Answers
Topic: Get 6F00 Error code
Replies: 1
Views: 9039

Get 6F00 Error code

When I run my client applet, the output appeared 6F 00 error code. Where do I make the mistake? Could somebody give me some clues? Thanks. Here is my code. Server Applet package hcl.demo.server; import javacard.framework.AID; import javacard.framework.APDU; import javacard.framework.Applet; import j...
by Riddle
Wed Jun 15, 2016 5:08 am
Forum: Questions & Answers
Topic: RuntimeException v.s. Exception
Replies: 2
Views: 8344

Re: RuntimeException v.s. Exception

So, in your opinion，the difference between Exception and RuntimeException is that Exception is meant to happen not at runtime.
by Riddle
Wed May 25, 2016 1:31 am
Forum: Shopping FAQ
Topic: Make A40CR card support T=0 and Mifare 4K
Replies: 1
Views: 7953

Make A40CR card support T=0 and Mifare 4K

Hello!

I have placed an order yesterday and now it's probably a little late, but what can I do to make A40CR card support T=0 and Mifare 4K after I receive the cards?

Cheers,
R
by Riddle
Wed Mar 09, 2016 5:15 am
Forum: Questions & Answers
Topic: Change native implementation of javax.smatcardio
Replies: 1
Views: 6488

Change native implementation of javax.smatcardio

I am programming an applet which uses javax.smatcardio APIs and I want to change native implementation of that.
Could anyone give me some pointers? Thanks
by Riddle
Wed Feb 17, 2016 2:44 am
Forum: Card Products
Topic: keys on card
Replies: 6
Views: 15277

Re: keys on card

I see! Thanks very much for your help, @popmun09. You help me out. :lol:
by Riddle
Wed Feb 17, 2016 2:26 am
Forum: Card Products
Topic: keys on card
Replies: 6
Views: 15277

Re: keys on card

Another question:

These keys are only used for Card Pesonalization. Once the card has been personalized, these keys will never be used any more. Am I right?
by Riddle
Wed Feb 17, 2016 2:24 am
Forum: Card Products
Topic: keys on card
Replies: 6
Views: 15277

Re: keys on card

popmun09 wrote:You are right. The Issuer Security Domain is a GlobalPlatform concept.
The key of ISD is basic for the card, which allows you to create security domains and do other operations.


Hi bro,

As this key is given by card issuer, can I change it according to my requirement?
by Riddle
Mon Feb 15, 2016 5:49 am
Forum: Card Products
Topic: keys on card
Replies: 6
Views: 15277

keys on card

I have an EMV card and its datasheet. From the doc, I know that the key value of issuer security domain(encryption, MAC,and key encryption key): 404142434445464748494a4b4c4d4e4f. and the value of sequence counter is 0. Is this key KMC? As I know that KMC never reside in the card. Static Keys Derived...
by Riddle
Fri Jan 22, 2016 4:28 am
Forum: Questions & Answers
Topic: Can I access the memory of Second SIM using javacard application?
Replies: 1
Views: 6067

Can I access the memory of Second SIM using javacard application?

Hi everyone!
I have a problem:
Can I access the memory of Second SIM Card in a mobile using java card technology? In case I am using a dual SIM Card.
Thanks for any answer.

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