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Search found 31 matches

by bigWhite
Thu Mar 07, 2019 11:30 pm
Forum: Questions & Answers
Topic: Is there any way to get the EEPROM size of a Java Card?
Replies: 3
Views: 797

Re: Is there any way to get the EEPROM size of a Java Card?

hello, You can get it from the card supplier, or use the following API function to get. /** * Obtains the amount of memory of the specified type that is available to * the applet. Note that implementation-dependent memory overhead structures * may also use the same memory pool. * <p> * Notes: * <ul>...
by bigWhite
Mon Mar 04, 2019 4:12 am
Forum: Algorithm School
Topic: gen key of rsa online tool not work
Replies: 2
Views: 1460

Re: gen key of rsa online tool not work

Logan wrote:
Sat Feb 09, 2019 10:55 am
currently, generating keypaire is in error status.
Now, the RSA online tool is working fine.
by bigWhite
Thu Jan 17, 2019 5:34 am
Forum: Questions & Answers
Topic: What is the difference between NFC card and contact-less smart card?
Replies: 4
Views: 1061

Re: What is the difference between NFC card and contact-less smart card?

Near-field communication (NFC) is a set of communication protocols that enable two electronic devices, one of which is usually a portable device such as a smartphone, to establish communication by bringing them within 4 cm (1.6 in) of each other NFC is faster than Bluetooth (424 kbps ), and it can ...
by bigWhite
Wed Jan 02, 2019 5:25 am
Forum: Questions & Answers
Topic: Development environment configuration
Replies: 4
Views: 1283

Re: Development environment configuration

Do you want to develop the applet using eclispe? Maybe you can try to install the JCKit. After the automatic installation is successful, It don't need any environment configuration. I personally like it very much.
by bigWhite
Mon Dec 24, 2018 6:14 am
Forum: Algorithm School
Topic: The difference between SHA, AES and RSA algorithm?
Replies: 4
Views: 1690

Re: The difference between SHA, AES and RSA algorithm?

AES is a symmetric block cipher algorithm

RSA is an asymmetric encryption algorithm
by bigWhite
Wed Aug 29, 2018 11:51 pm
Forum: pyGlobalPlatform
Topic: GP Card Manager Failed
Replies: 3
Views: 6327

Re: GP Card Manager Failed

If you fail to download the CAP, the install and select applet will definitely be failed.
Select GP Card Manager failed, it may be that the card's GP key has been modified, not the default 0x40-0x4F
by bigWhite
Thu May 10, 2018 5:07 am
Forum: Shopping FAQ
Topic: How can I get the AID of ISD?
Replies: 5
Views: 1578

Re: How can I get the AID of ISD?

newbiecat wrote:What is the define APDU of the select CardManager? Where can I find the description of related documents?


You can refer to the GP GlobalPlatform specification.
GlobalPlatform.png
by bigWhite
Thu May 03, 2018 5:24 am
Forum: Shopping FAQ
Topic: How can I get the AID of ISD?
Replies: 5
Views: 1578

Re: How can I get the AID of ISD?

Maybe, you can get it by sending the command of 'select CardManager'.
by bigWhite
Wed Mar 21, 2018 3:00 am
Forum: Algorithm School
Topic: How to generate random data?
Replies: 2
Views: 1085

Re: How to generate random data?

RandomData rand = RandomData.getInstance(RandomData.ALG_SECURE_RANDOM); short lenBytes = (short) (KeyBuilder.LENGTH_DES3_3KEY/8); byte[] buffer = JCSystem.makeTransientByteArray(lenBytes, JCSystem.CLEAR_ON_DESELECT); DESKey key = (DESKey) KeyBuilder.buildKey(KeyBuilder.TYPE_DES, KeyBuilder.LENGTH_D...
by bigWhite
Sun Mar 11, 2018 10:05 pm
Forum: Questions & Answers
Topic: ACR122U
Replies: 4
Views: 1141

Re: ACR122U

thanks for your answer, but my really question, how to make sure that the card has connected to the reader?, because i have tried another command but the return is error value too. how to make sure that the card has connected to the reader? If you connected failed, you will not able to send APDUs, ...
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