Your GPO command seems to have quite a lot of issues: 80 A8 0000 01 00000001 000000001000 823DDE7A 1240 0 ^^ ^^^^^ ^^^^^^^^ ^^^^ ^^ 4. 1. 2. 3. 5. First of all, your GPO command sends several data bytes without context. You need to wrap your data items into a PDOL related data object: … Read more
The authentication keys and the access conditions for each sector of a MIFARE card are located in the last block of that sector (the sector trailer). You can update this block with new access conditions and authentication keys using a regular write command. The sector trailer looks like this: +—————————–+————–+—-+—————————–+ | 0 | 1 | … Read more
That depends on what type of tag you use and what level of protection against cloning you want. NFC tags (as defined by the NFC Forum) have no protection against cloning. Such tags are intended as containers for freely readable data (so called NDEF messages). Anyone could read an NDEF message from one tag and … Read more