Agnos Availability

Supported

Supported

Not Supported

Supported

Not Supported

Configuration

• 0xDF811D, torn depth

• 0xDF811C, max lifetime

• 0xDF1D, torn depth

• 0xDF1C, max lifetime

• 0xDF1D, torn depth

• 0xDF1C, max lifetime

• C7 B3b6, Terminal Transaction Processing Information

Trigger

• Generate AC not completed

• Generate AC not completed

• Read Record not completed

• Generate AC #1 and Generate AC #2 not completed

Restart

• Start B

• END APPLICATION

• Start B

• PRESENT CARD AGAIN

• TRY AGAIN

• Start B

• PRESENT CARD AGAIN

• TRY AGAIN

• Start B

• PRESENT CARD AGAIN

Storage Mechanism

• When a torn occurs, add a torn record:

  • 57 (primary key)

  • if CDA supported:

    • 9F38

    • 8C

    • 9F37

• When a torn occurs, add a torn record:

  • 9A (primary key)

  • 9F21 (primary key)

  • PAN for 5A and/or 57 (primary key)

  • 57

  • 94

  • 9F36

  • 82

  • 9F10

  • 9FD

  • 9F6C

  • 9F37

  • 9F26

  • 9F02

  • 5F2A

Check Point

• The kernel is reactivated to perform a brand new transaction

• After Final Select, the kernel checks whether there is a torn situation

• Indicator: AgnosTVR B20b1

• The kernel is reactivated to perform a brand new transaction

• Before Final Select, the kernel checks whether there is a torn situation

• The kernel is reactivated and is set to jump to one of the torn states (when the torn was detected):

  • Recovery from Generate AC #1

  • Recovery from Generate AC #2

Too Old Verification

• Yes

• No

• Yes. If too old then torn record is removed

• No

Recovery Mechanism

• Echo performed at a specific state, occurring between Final Select and GPO

• Tearing Transaction Recovery

• Echo performed right after the occurrence of the Generate AC (once the start B was processed by the entry point)

Recovery APDU

• 80 DF 00 00 00

• Not implemented

• 80 DF 00 xx where xx corresponds to the Generate AC number (1 or 2)

Recovery Principle

• From Echo command, fetch tags to be used at Generate AC time

• Not implemented

After Recovery

• Card processing is resumed to reach the next step: GPO

• Not implemented

When recovery fails

• If communication error:

  • END APPLICATION

  • Start B

  • A brand new transaction will start

• Else

  • The transaction is resumed:

    • In torn mode if no status word error

    • Like a regular transaction is any other error

N/A

• Generate AC #1 recovery:

  • If communication error:

    • TRY AGAIN

    • Start B

    • A brand new transaction will start

  • Else if cancellation:

    • END APPLICATION

    • STOP

  • Else if status word error:

    • SELECT NEXT RETRY

    • Start C

    • A brand new transaction will start

  • Else (normal path):

• Generate AC #2 recovery:

  • if communication error:

    • TRY AGAIN

    • Start A

    • A brand new transaction will start

  • Else (normal path)

    • Attempt to perform EMV completion

Specifics

N/A

• The ability to support a torn transaction also depends on the card (presence of PURE Echo card id, tag 9F75, in FCI/BF0C)