nfc

How to launch my app via NFC tag?

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Windows 10 Mobile UWP If you are only targeting Windows 10 Mobile, the 8.1 way still works, given that you get the right App ID. It can be retrieved through: Windows.ApplicationModel.Store.CurrentApp.AppId However, that only works when the app is installed through the store, as the ID is assigned during store association / publishing. In developer … Read more

How to check whether NFC is enabled or not in android?

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NfcManager manager = (NfcManager) context.getSystemService(Context.NFC_SERVICE); NfcAdapter adapter = manager.getDefaultAdapter(); if (adapter != null && adapter.isEnabled()) { // adapter exists and is enabled. } You cannot enable the NFC programmatically. The user has to do it manually through settings or hardware button.

Android: Authenticating with NXP MiFare Ultralight C

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Below is an example java code to perform Ultralight-C authentication as described in MF0ICU2 / MIFARE Ultralight C – Contactless ticket IC document (chapter 7.5.5 — 3DES Authentication, page 15): public void authenticate(byte[] key) throws CardException { System.out.println(“AUTHENTICATE”); byte[] encRndB = transmitRaw(new byte[] { 0x1A, 0x00 }); if((encRndB.length!=9)||(encRndB[0]!=AF)) { throw new RuntimeException(“Invalid response!”); } encRndB=Arrays.copyOfRange(encRndB, … Read more

Emulate Mifare card with Android 4.4

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With host-based card emulation (HCE) in Android 4.4 you can only emulate the ISO/IEC 14443-4 protocol. More specifically you can only emulate application structures according to ISO/IEC 7816-4 (thus card emulation applications need to be selected though an AID). Moreover, the API doesn’t give you any means to specify if card emulation should be done … Read more

Serials on NFC Tags – truly unique? cloneable?

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Are serial numbers of NFC tags truely unique? That depends on the tag product and what you consider truely unique. E.g.: ISO 14443 Type A tags with 4 byte serial numbers: There certainly exist duplicates (mainly because there is no clear scheme to divide the available range of serial numbers among the various manufacturers) and … Read more