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Search found 15 matches

by mikegigom
Fri Jul 14, 2017 5:49 am
Forum: Questions & Answers
Topic: How to read bank serial
Replies: 2
Views: 266

Re: How to read bank serial

I have read the EMV spec.
And I have finished some simple steps. Now I need to validate the card. How can I validate the card with "internal authenticate" ? Can I use some public key and signature method ?
by mikegigom
Thu Jul 13, 2017 10:57 pm
Forum: Questions & Answers
Topic: How to read bank serial
Replies: 2
Views: 266

How to read bank serial

I need to be able to uniquely identify any bank card and validate that they are not fake ones. Further I'd like to validate the user's PIN. And I donot want to run any applet with it - I just want to read the unique ID of the card to validate that the card is not created manually and validate that t...
by mikegigom
Tue Jan 31, 2017 1:46 am
Forum: Questions & Answers
Topic: secure channel initiation mode implicit
Replies: 4
Views: 923

Re: secure channel initiation mode implicit

The steps are much the same as the explicit, except there is not INIT-UPDATE/EXT-AUTH commands to deal with. When the first secured APDU is received (CLA = 0x84), you follow the process to generate session keys and verify the MAC. The card spec outlines how to generate a MAC with the session keys. ...
by mikegigom
Sun Jan 29, 2017 8:44 am
Forum: Questions & Answers
Topic: secure channel initiation mode implicit
Replies: 4
Views: 923

secure channel initiation mode implicit

Hello, it's me again.

Can somebody here explain the mechanism of secure channel initiation on mode implicit? I already have a look at the specification, the introduction about GlobalPlatform initiation mode implicit is very simple.

So hope expert guide me how to do it.

Any help is appreciated.
by mikegigom
Wed Sep 07, 2016 11:45 pm
Forum: Questions & Answers
Topic: test the performance of javacard
Replies: 1
Views: 512

Re: test the performance of javacard

There is a tool that can test all the algorithms supported by java card.
JCAlgTest: viewtopic.php?f=30&t=40
by mikegigom
Tue May 31, 2016 5:42 am
Forum: Algorithm School
Topic: ECDSA signature
Replies: 5
Views: 1445

Re: ECDSA signature

Usiger wrote:There is a step in the process of generating ECDSA signature - generate a random number, which causes different results.


Is there anyway to use the same random number so that I can get the same ECDSA signature?
by mikegigom
Mon May 30, 2016 4:29 am
Forum: Algorithm School
Topic: ECDSA signature
Replies: 5
Views: 1445

ECDSA signature

I have created an EC key pair and I tried to use the same data and EC private key to generate ECDSA signature. But I found that each signature is different from the previous one. Why the value is different? What can I do to make the signature same? Signature sig1 = Signature.getInstance(Signature.AL...
by mikegigom
Sat Mar 26, 2016 4:05 am
Forum: Card Products
Topic: derived keys
Replies: 2
Views: 806

derived keys

My card needs to implement the mutual authentication. For that purpose the outside card application and the card must share the set of secret keys. The first key is relevant for encryption and the other for the MAC calculation. At this point I am putting these keys on the card during the personaliza...
by mikegigom
Thu Dec 31, 2015 2:25 am
Forum: Card Products
Topic: Difference between contact and contactless card
Replies: 1
Views: 657

Re: Difference between contact and contactless card

In fact, there is no difference between the contact and contactless card in APDU field. However,in the case of contact interface, for APDU command between T=0 and T=1 there is a little difference. T=0 protocol cannot distinguish between the Lc and Le bytes. So it uses specific status words, such as ...
by mikegigom
Sat Dec 19, 2015 2:22 am
Forum: Questions & Answers
Topic: Leak of memory on java card
Replies: 1
Views: 322

Leak of memory on java card

I have installed an applet on a java card. And the applet runs for 3 times without deselecting the applet.Then it returns "6F 00". Is that due to javacard leak of memory?
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