Default applets on a fresh javacard

Question

I received a bunch of blank javacard (I mean I didn't write anything on them) some days ago as gift from a friend!

When I list its content using gpj -list ,I receive the below output :

E:\Smart Card\gpj>gpj -list

E:\Smart Card\gpj>java -jar gpj.jar -list
Found terminals: [PC/SC terminal ACS CCID USB Reader 0]
Found card in terminal: ACS CCID USB Reader 0
ATR: 3B 68 00 00 00 73 C8 40 12 00 90 00

DEBUG: Command  APDU: 00 A4 04 00 08 A0 00 00 00 03 00 00 00
DEBUG: Response APDU: 6F 10 84 08 A0 00 00 00 03 00 00 00 A5 04 9F 65 01 FF 90 0
0
Successfully selected Security Domain OP201a A0 00 00 00 03 00 00 00

DEBUG: Command  APDU: 80 50 00 00 08 CF 3E F5 E1 32 B7 B2 6B
DEBUG: Response APDU: 00 00 11 60 01 00 8B 79 0A F9 FF 02 00 03 B5 00 CF 85 24 1
E BA 36 1E 49 97 56 F1 60 90 00
DEBUG: Command  APDU: 84 82 00 00 10 87 4B 25 EC 1E 8A E5 B4 A8 53 2E F0 13 BB 8
0 91
DEBUG: Response APDU: 90 00
DEBUG: Command  APDU: 84 82 00 00 08 87 4B 25 EC 1E 8A E5 B4
DEBUG: Response APDU: 90 00
DEBUG: Command  APDU: 80 F2 80 00 02 4F 00
DEBUG: Response APDU: 08 A0 00 00 00 03 00 00 00 01 9E 90 00
DEBUG: Command  APDU: 80 F2 80 00 02 4F 00
DEBUG: Response APDU: 08 A0 00 00 00 03 00 00 00 01 9E 90 00
DEBUG: Command  APDU: 80 F2 40 00 02 4F 00
DEBUG: Response APDU: 6A 88
DEBUG: Command  APDU: 80 F2 40 00 02 4F 00
DEBUG: Response APDU: 6A 88
DEBUG: Command  APDU: 80 F2 10 00 02 4F 00
DEBUG: Response APDU: 6A 81
DEBUG: Command  APDU: 80 F2 10 00 02 4F 00
DEBUG: Response APDU: 6A 81
DEBUG: Command  APDU: 80 F2 20 00 02 4F 00
DEBUG: Response APDU: 07 A0 00 00 00 03 53 50 01 00 06 A0 00 00 00 03 10 01 00 0
5 XX XX XX XX XX 01 00 08 XX XX XX XX XX 00 10 00 01 00 08 XX XX XX XX XX 00 30
00 01 00 05 XX XX XX XX XX 01 00 05 XX XX XX XX XX 01 00 06 A0 00 00 00 04 10 01
 00 06 A0 00 00 XX XX 01 01 00 07 A0 00 00 00 03 86 98 01 00 90 00
DEBUG: Command  APDU: 80 F2 20 00 02 4F 00
DEBUG: Response APDU: 07 A0 00 00 00 03 53 50 01 00 06 A0 00 00 00 03 10 01 00 0
5 XX XX XX XX XX 01 00 08 XX XX XX XX XX 00 10 00 01 00 08 XX XX XX XX XX 00 30
00 01 00 05 XX XX XX XX XX 01 00 05 XX XX XX XX XX 01 00 06 A0 00 00 00 04 10 01
 00 06 A0 00 00 XX XX 01 01 00 07 A0 00 00 00 03 86 98 01 00 90 00
AID: A0 00 00 00 03 00 00 00                       |........|        ISD LC: 1 P
R: 0x9E

AID: A0 00 00 00 03 53 50                          |.....SP|         Exe LC: 1 P
R: 0x00

AID: A0 00 00 00 03 10                             |......|          Exe LC: 1 P
R: 0x00

AID: XX XX XX XX XX                                |1PAY.|           Exe LC: 1 P
R: 0x00

AID: XX XX XX XX XX 00 10 00                       |..e.....|        Exe LC: 1 P
R: 0x00

AID: XX XX XX XX XX 00 30 00                       |..e...0.|        Exe LC: 1 P
R: 0x00

AID: XX XX XX XX XX                                |..e..|           Exe LC: 1 P
R: 0x00

AID: XX XX XX XX XX                                |..e.0|           Exe LC: 1 P
R: 0x00

AID: A0 00 00 00 04 10                             |......|          Exe LC: 1 P
R: 0x00

AID: A0 00 00 XX XX 01                             |....3.|          Exe LC: 1 P
R: 0x00

AID: A0 00 00 00 03 86 98                          |.......|         Exe LC: 1 P
R: 0x00

The question is:

How I can understand what is the functionality of each AIDs? I mean how can I work with them?

Note : I don't know which company create these cards.

Answer 1

The first 5 bytes are the RID of the creator of the Applet. They are used as an identifier, as specified in ISO/IEC 7816-5 .

So I guess your card is a card was generated for a specific payment service (RID: A0 00 00 XX XX). Unsurprisingly it has some payment related applets on it from VISA (RID: A0000003) and Mastercard (RID: A0000004).

For more info on how to use these kind of applets, you should probably consult the EMV specifications, and - of course - the unnamed payment service.

They are likely there because the Applet code is stored in the ROM, so the Applet does not have to be uploaded to the card. Making ROM masks is very expensive, but so is uploading an Applet millions of times.