error with cap about python-emv HOT 15 CLOSED

Blimey, that was quick! You wrote:

Yes, if you mean: 'Available apps: "Visa Debit", "LINK ATM", “BARCLAYS”’ That’s what I get with a Barclays card, followed by what looks like a complete set of card info. With a Nationwide card: Available apps: "Visa Debit” and again all looks good. It’s the `cap` command that gives trouble. With three Visa debit cards – two Barclays and one Nationwide (which works in a Barclays card reader and vice versa) – I’ve got three different errors: Mostly this one, which I quoted before: Traceback (most recent call last): File "/Users/charles/Library/Python/3.6/bin/emvtool", line 11, in <module> sys.exit(run()) File "/Users/charles/Library/Python/3.6/lib/python/site-packages/emv/command/client.py", line 37, in run EMVClient().run() File "/Users/charles/Library/Python/3.6/lib/python/site-packages/emv/command/client.py", line 75, in run self.args.func() File "/Users/charles/Library/Python/3.6/lib/python/site-packages/emv/command/client.py", line 130, in cap except InvalidPINException as e: TypeError: catching classes that do not inherit from BaseException is not allowed But I also saw these, though I can’t seem to reproduce them: Traceback (most recent call last): File "/Users/charles/Library/Python/3.6/lib/python/site-packages/emv/command/client.py", line 129, in cap value=self.args.amount)) File "/Users/charles/Library/Python/3.6/lib/python/site-packages/emv/card.py", line 88, in generate_cap_value self.select_application(apps[-1][Tag.ADF_NAME]) KeyError: -1 and: Traceback (most recent call last): File "/Users/charles/Library/Python/3.6/lib/python/site-packages/emv/command/client.py", line 129, in cap value=self.args.amount)) File "/Users/charles/Library/Python/3.6/lib/python/site-packages/emv/card.py", line 99, in generate_cap_value self.verify_pin(pin) File "/Users/charles/Library/Python/3.6/lib/python/site-packages/emv/card.py", line 73, in verify_pin res = self.tp.exchange(VerifyCommand(pin)) File "/Users/charles/Library/Python/3.6/lib/python/site-packages/emv/protocol/command.py", line 168, in __init__ data = b'2%x%s' % (len(str(pin)), pin) TypeError: %b requires a bytes-like object, or an object that implements __bytes__, not ‘str’ Does that help? Very best Charles

as in: `emvtool -p xxxx cap` where xxxx is a PIN. That’s correct, isn’t it?

Russ You wrote:

Thanks for that. I was previously trying to install via pip3 from the remote repository and it wasn’t working (I had to download it first). Now I have 1.0.1 in place. "Requirement not upgraded as not directly required:" terminaltables argparse pycountry pyscard click enum-compat are those OK?

File "/usr/local/bin/emvtool", line 11, in <module> sys.exit(run()) File "/usr/local/lib/python3.6/site-packages/emv/command/client.py", line 45, in run cli(obj={}) File "/usr/local/lib/python3.6/site-packages/click/core.py", line 722, in __call__ return self.main(*args, **kwargs) File "/usr/local/lib/python3.6/site-packages/click/core.py", line 697, in main rv = self.invoke(ctx) File "/usr/local/lib/python3.6/site-packages/click/core.py", line 1066, in invoke return _process_result(sub_ctx.command.invoke(sub_ctx)) File "/usr/local/lib/python3.6/site-packages/click/core.py", line 895, in invoke return ctx.invoke(self.callback, **ctx.params) File "/usr/local/lib/python3.6/site-packages/click/core.py", line 535, in invoke return callback(*args, **kwargs) File "/usr/local/lib/python3.6/site-packages/click/decorators.py", line 17, in new_func return f(get_current_context(), *args, **kwargs) File "/usr/local/lib/python3.6/site-packages/emv/command/client.py", line 131, in cap click.echo(card.generate_cap_value(ctx.obj['pin'], challenge=challenge, value=amount)) File "/usr/local/lib/python3.6/site-packages/emv/card.py", line 90, in generate_cap_value self.select_application(apps[-1][Tag.ADF_NAME]) KeyError: -1 Cheers Charles

Sorry, that was from `emvtool -p <PIN> cap`, if that wasn’t obvious.

Russ You wrote:

Thanks. Now on 1.0.2. Tested with three Visa debit cards. One (Barclays business account) now seems to work fine: charles@Charles-Mac-mini:~$ emvtool -p 0000 cap 40253358 I’ve not tested that code, but I assume that since we’re getting a credible value all is OK. It handles an incorrect PIN properly, too. Two other cards now give errors on reading card data as well as the cap command. Barclays personal account card emvtool info [card data mostly displayed OK, but: 2PAY.SYS.DDF01 (Index of apps for contactless payments) Unable to access app: <ErrorResponse: "Wrong parameter(s) P1 P2; file not found"> Available named apps: "Visa Debit”] then: Traceback (most recent call last): File "/usr/local/bin/emvtool", line 11, in <module> sys.exit(run()) File "/usr/local/lib/python3.6/site-packages/emv/command/client.py", line 48, in run cli(obj={}) File "/usr/local/lib/python3.6/site-packages/click/core.py", line 722, in __call__ return self.main(*args, **kwargs) File "/usr/local/lib/python3.6/site-packages/click/core.py", line 697, in main rv = self.invoke(ctx) File "/usr/local/lib/python3.6/site-packages/click/core.py", line 1066, in invoke return _process_result(sub_ctx.command.invoke(sub_ctx)) File "/usr/local/lib/python3.6/site-packages/click/core.py", line 895, in invoke return ctx.invoke(self.callback, **ctx.params) File "/usr/local/lib/python3.6/site-packages/click/core.py", line 535, in invoke return callback(*args, **kwargs) File "/usr/local/lib/python3.6/site-packages/click/decorators.py", line 17, in new_func return f(get_current_context(), *args, **kwargs) File "/usr/local/lib/python3.6/site-packages/emv/command/client.py", line 120, in info render_app(card, app[Tag.ADF_NAME], redact) File "/usr/local/lib/python3.6/site-packages/emv/command/client.py", line 93, in render_app rec = card.read_record(j, sfi=i).data File "/usr/local/lib/python3.6/site-packages/emv/card.py", line 33, in read_record return self.tp.exchange(ReadCommand(record_number, sfi)) File "/usr/local/lib/python3.6/site-packages/emv/transmission.py", line 51, in exchange res = RAPDU.unmarshal(data + [sw1, sw2]) File "/usr/local/lib/python3.6/site-packages/emv/protocol/response.py", line 27, in unmarshal obj.data = TLV.unmarshal(data[:-2]) File "/usr/local/lib/python3.6/site-packages/emv/protocol/structures.py", line 39, in unmarshal value = TLV.unmarshal(value) File "/usr/local/lib/python3.6/site-packages/emv/protocol/structures.py", line 39, in unmarshal value = TLV.unmarshal(value) File "/usr/local/lib/python3.6/site-packages/emv/protocol/structures.py", line 49, in unmarshal value = CVMList.unmarshal(value) File "/usr/local/lib/python3.6/site-packages/emv/protocol/structures.py", line 247, in unmarshal cvm_list.y = decode_int(data[4:8]) File "/usr/local/lib/python3.6/site-packages/emv/util.py", line 33, in decode_int result = val[0] IndexError: list index out of range charles@Charles-Mac-mini:~$ emvtool -p 0000 cap Traceback (most recent call last): File "/usr/local/bin/emvtool", line 11, in <module> sys.exit(run()) File "/usr/local/lib/python3.6/site-packages/emv/command/client.py", line 48, in run cli(obj={}) File "/usr/local/lib/python3.6/site-packages/click/core.py", line 722, in __call__ return self.main(*args, **kwargs) File "/usr/local/lib/python3.6/site-packages/click/core.py", line 697, in main rv = self.invoke(ctx) File "/usr/local/lib/python3.6/site-packages/click/core.py", line 1066, in invoke return _process_result(sub_ctx.command.invoke(sub_ctx)) File "/usr/local/lib/python3.6/site-packages/click/core.py", line 895, in invoke return ctx.invoke(self.callback, **ctx.params) File "/usr/local/lib/python3.6/site-packages/click/core.py", line 535, in invoke return callback(*args, **kwargs) File "/usr/local/lib/python3.6/site-packages/click/decorators.py", line 17, in new_func return f(get_current_context(), *args, **kwargs) File "/usr/local/lib/python3.6/site-packages/emv/command/client.py", line 146, in cap click.echo(card.generate_cap_value(ctx.obj['pin'], challenge=challenge, value=amount)) File "/usr/local/lib/python3.6/site-packages/emv/card.py", line 103, in generate_cap_value app_data = self.get_application_data(opts['AFL']) File "/usr/local/lib/python3.6/site-packages/emv/card.py", line 70, in get_application_data res = self.tp.exchange(ReadCommand(start_rec, sfi)) File "/usr/local/lib/python3.6/site-packages/emv/transmission.py", line 51, in exchange res = RAPDU.unmarshal(data + [sw1, sw2]) File "/usr/local/lib/python3.6/site-packages/emv/protocol/response.py", line 27, in unmarshal obj.data = TLV.unmarshal(data[:-2]) File "/usr/local/lib/python3.6/site-packages/emv/protocol/structures.py", line 39, in unmarshal value = TLV.unmarshal(value) File "/usr/local/lib/python3.6/site-packages/emv/protocol/structures.py", line 39, in unmarshal value = TLV.unmarshal(value) File "/usr/local/lib/python3.6/site-packages/emv/protocol/structures.py", line 49, in unmarshal value = CVMList.unmarshal(value) File "/usr/local/lib/python3.6/site-packages/emv/protocol/structures.py", line 247, in unmarshal cvm_list.y = decode_int(data[4:8]) File "/usr/local/lib/python3.6/site-packages/emv/util.py", line 33, in decode_int result = val[0] IndexError: list index out of range Nationwide card (works in Barclays card reader and vice-versa) emvtool info [card data displayed OK] WARNING:emv.protocol.structures:Invalid TLV - too short: [] Traceback (most recent call last): File "/usr/local/bin/emvtool", line 11, in <module> sys.exit(run()) File "/usr/local/lib/python3.6/site-packages/emv/command/client.py", line 48, in run cli(obj={}) File "/usr/local/lib/python3.6/site-packages/click/core.py", line 722, in __call__ return self.main(*args, **kwargs) File "/usr/local/lib/python3.6/site-packages/click/core.py", line 697, in main rv = self.invoke(ctx) File "/usr/local/lib/python3.6/site-packages/click/core.py", line 1066, in invoke return _process_result(sub_ctx.command.invoke(sub_ctx)) File "/usr/local/lib/python3.6/site-packages/click/core.py", line 895, in invoke return ctx.invoke(self.callback, **ctx.params) File "/usr/local/lib/python3.6/site-packages/click/core.py", line 535, in invoke return callback(*args, **kwargs) File "/usr/local/lib/python3.6/site-packages/click/decorators.py", line 17, in new_func return f(get_current_context(), *args, **kwargs) File "/usr/local/lib/python3.6/site-packages/emv/command/client.py", line 109, in info render_app(card, '1PAY.SYS.DDF01', redact) File "/usr/local/lib/python3.6/site-packages/emv/command/client.py", line 94, in render_app click.echo(as_table(rec[Tag.RECORD], 'File: %s,%s' % (i, j), redact=redact)) KeyError: 112 charles@Charles-Mac-mini:~$ emvtool -p 0000 cap Traceback (most recent call last): File "/usr/local/bin/emvtool", line 11, in <module> sys.exit(run()) File "/usr/local/lib/python3.6/site-packages/emv/command/client.py", line 48, in run cli(obj={}) File "/usr/local/lib/python3.6/site-packages/click/core.py", line 722, in __call__ return self.main(*args, **kwargs) File "/usr/local/lib/python3.6/site-packages/click/core.py", line 697, in main rv = self.invoke(ctx) File "/usr/local/lib/python3.6/site-packages/click/core.py", line 1066, in invoke return _process_result(sub_ctx.command.invoke(sub_ctx)) File "/usr/local/lib/python3.6/site-packages/click/core.py", line 895, in invoke return ctx.invoke(self.callback, **ctx.params) File "/usr/local/lib/python3.6/site-packages/click/core.py", line 535, in invoke return callback(*args, **kwargs) File "/usr/local/lib/python3.6/site-packages/click/decorators.py", line 17, in new_func return f(get_current_context(), *args, **kwargs) File "/usr/local/lib/python3.6/site-packages/emv/command/client.py", line 146, in cap click.echo(card.generate_cap_value(ctx.obj['pin'], challenge=challenge, value=amount)) File "/usr/local/lib/python3.6/site-packages/emv/card.py", line 107, in generate_cap_value resp = self.tp.exchange(get_arqc_req(app_data, challenge=challenge, value=value)) File "/usr/local/lib/python3.6/site-packages/emv/cap.py", line 34, in get_arqc_req cdol1 = app_data[0x8C] KeyError: 140 Any help? Charles

Hi Russ You wrote:

Thanks. 1.0.3 still errors with the second Barclays card, however: charles@Charles-Mac-mini:~$ emvtool -p 0000 cap WARNING:emv.protocol.structures:Invalid TLV - too short: [3] WARNING:emv.protocol.structures:Invalid TLV - too short: [3] Traceback (most recent call last): File "/usr/local/bin/emvtool", line 11, in <module> sys.exit(run()) File "/usr/local/lib/python3.6/site-packages/emv/command/client.py", line 48, in run cli(obj={}) File "/usr/local/lib/python3.6/site-packages/click/core.py", line 722, in __call__ return self.main(*args, **kwargs) File "/usr/local/lib/python3.6/site-packages/click/core.py", line 697, in main rv = self.invoke(ctx) File "/usr/local/lib/python3.6/site-packages/click/core.py", line 1066, in invoke return _process_result(sub_ctx.command.invoke(sub_ctx)) File "/usr/local/lib/python3.6/site-packages/click/core.py", line 895, in invoke return ctx.invoke(self.callback, **ctx.params) File "/usr/local/lib/python3.6/site-packages/click/core.py", line 535, in invoke return callback(*args, **kwargs) File "/usr/local/lib/python3.6/site-packages/click/decorators.py", line 17, in new_func return f(get_current_context(), *args, **kwargs) File "/usr/local/lib/python3.6/site-packages/emv/command/client.py", line 147, in cap click.echo(card.generate_cap_value(ctx.obj['pin'], challenge=challenge, value=amount)) File "/usr/local/lib/python3.6/site-packages/emv/card.py", line 110, in generate_cap_value resp = self.tp.exchange(get_arqc_req(app_data, challenge=challenge, value=value)) File "/usr/local/lib/python3.6/site-packages/emv/cap.py", line 34, in get_arqc_req cdol1 = app_data[0x8C] KeyError: 140

Perhaps not, since it generates exactly the same error ;-) Thanks Charles PS Here are details of the failing Barclays card in case it helps. I redacted the hex strings in case there’s anything sensitive in there. emvtool info 1PAY.SYS.DDF01 (Index of apps for chip payments) ┌FCI Proprietary Data─────────────┬───────┐ │ Tag │ Name │ Value │ ├─────────┼───────────────────────┼───────┤ │ [5F 2D] │ Language Preference │ "en" │ │ [88] │ Short File Identifier │ [01] │ └─────────┴───────────────────────┴───────┘ ┌File: 1,1────────────────────┬─────────────────────────────────────────────────────────────────────────────────┐ │ Tag │ Name │ Value │ ├──────┼──────────────────────┼─────────────────────────────────────────────────────────────────────────────────┤ │ [61] │ Application Template │ { (4F) Application Dedicated File (ADF) Name: [00 00 00 00 00 00 00], (50) │ │ │ │ Application Label: "Visa Debit", (87) Application Priority Indicator: 2, (73) │ │ │ │ Directory Discretionary Template: { ([9F 0A]) Application Selection Registered │ │ │ │ Proprietary Data: <ASRPD: Electronic Product Identification: Debit>}} │ └──────┴──────────────────────┴─────────────────────────────────────────────────────────────────────────────────┘ ┌File: 1,2────────────────────┬─────────────────────────────────────────────────────────────────────────────┐ │ Tag │ Name │ Value │ ├──────┼──────────────────────┼─────────────────────────────────────────────────────────────────────────────┤ │ [61] │ Application Template │ { (4F) Application Dedicated File (ADF) Name: [00 00 00 00 00 00 00], (50) │ │ │ │ Application Label: "LINK ATM", (87) Application Priority Indicator: 1} │ └──────┴──────────────────────┴─────────────────────────────────────────────────────────────────────────────┘ ┌File: 1,3────────────────────┬─────────────────────────────────────────────────────────────────────────────┐ │ Tag │ Name │ Value │ ├──────┼──────────────────────┼─────────────────────────────────────────────────────────────────────────────┤ │ [61] │ Application Template │ { (4F) Application Dedicated File (ADF) Name: [00 00 00 00 00 00 00], (50) │ │ │ │ Application Label: "BARCLAYS", (87) Application Priority Indicator: 0} │ └──────┴──────────────────────┴─────────────────────────────────────────────────────────────────────────────┘ 2PAY.SYS.DDF01 (Index of apps for contactless payments) 2PAY.SYS.DDF01 not available (this is normal on some cards) Available named apps: "Visa Debit" Application "Visa Debit", DF Name: [00 00 00 00 00 00 00] ┌FCI Proprietary Data──────────────────────┬────────────────────────────────────────────────────────────────────────┐ │ Tag │ Name │ Value │ ├─────────┼────────────────────────────────┼────────────────────────────────────────────────────────────────────────┤ │ [50] │ Application Label │ "Visa Debit" │ │ [87] │ Application Priority Indicator │ 2 │ │ [5F 2D] │ Language Preference │ "en" │ │ [BF 0C] │ FCI Issuer Discretionary Data │ { ([9F 0A]) Application Selection Registered Proprietary Data: <ASRPD: │ │ │ │ Electronic Product Identification: Debit>} │ └─────────┴────────────────────────────────┴────────────────────────────────────────────────────────────────────────┘ ┌File: 1,1┬────────────────────────────┬───────────────────────────────────────────────────────────────────────────┐ │ Tag │ Name │ Value │ ├─────────┼────────────────────────────┼───────────────────────────────────────────────────────────────────────────┤ │ [5F 20] │ Cardholder Name │ "BUTCHER /C.MR" │ │ [57] │ Track 2 Equivalent Data │ [00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00] │ │ [9F 1F] │ Track 1 Discretionary Data │ [00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00] │ └─────────┴────────────────────────────┴───────────────────────────────────────────────────────────────────────────┘ WARNING:emv.protocol.structures:Invalid TLV - too short: [3] Traceback (most recent call last): File "/usr/local/bin/emvtool", line 11, in <module> sys.exit(run()) File "/usr/local/lib/python3.6/site-packages/emv/command/client.py", line 48, in run cli(obj={}) File "/usr/local/lib/python3.6/site-packages/click/core.py", line 722, in __call__ return self.main(*args, **kwargs) File "/usr/local/lib/python3.6/site-packages/click/core.py", line 697, in main rv = self.invoke(ctx) File "/usr/local/lib/python3.6/site-packages/click/core.py", line 1066, in invoke return _process_result(sub_ctx.command.invoke(sub_ctx)) File "/usr/local/lib/python3.6/site-packages/click/core.py", line 895, in invoke return ctx.invoke(self.callback, **ctx.params) File "/usr/local/lib/python3.6/site-packages/click/core.py", line 535, in invoke return callback(*args, **kwargs) File "/usr/local/lib/python3.6/site-packages/click/decorators.py", line 17, in new_func return f(get_current_context(), *args, **kwargs) File "/usr/local/lib/python3.6/site-packages/emv/command/client.py", line 121, in info render_app(card, app[Tag.ADF_NAME], redact) File "/usr/local/lib/python3.6/site-packages/emv/command/client.py", line 92, in render_app click.echo(as_table(rec[Tag.RECORD], 'File: %s,%s' % (i, j), redact=redact)) File "/usr/local/lib/python3.6/site-packages/emv/command/client.py", line 31, in as_table '\n'.join(textwrap.wrap(render_element(tag, value, redact=redact), 80))]) File "/usr/local/lib/python3.6/site-packages/emv/protocol/data.py", line 125, in render_element return repr(value) File "/usr/local/lib/python3.6/site-packages/emv/protocol/structures.py", line 69, in __repr__ out += render_element(key, val) File "/usr/local/lib/python3.6/site-packages/emv/protocol/data.py", line 125, in render_element return repr(value) File "/usr/local/lib/python3.6/site-packages/emv/protocol/structures.py", line 261, in __repr__ return "<CVM List x: %s, y: %s, rules: %s>" % (self.x, self.y, AttributeError: 'CVMList' object has no attribute ‘x'

You wrote:

… and 1.0.5, I see.

Aha. Turns out this card doesn’t have a Barclays app: emvtool listapps ┌Applications──────────┬────────────────────────┐ │ Index │ Label │ ADF │ ├───────┼──────────────┼────────────────────────┤ │ 0 │ "Visa Debit" │ [A0 00 00 00 03 10 10] │ └───────┴──────────────┴────────────────────────┘ Full error message below, but I guess the key is: Error in CAP generation: Application data doesn't include CDOL1 field: This card issued in my name, but on my dad’s account under a power of attorney. The odd things is that it works in a standalone card reader – I’ve just tested that by using it to log into my own account. Apart from the fact that it’s not contactless (possibly because my dad’s card isn’t either), I’d assumed it was the same as any other debit card. Gosh this stuff is complicated. Best Charles Just in case, here’s the output from the Visa Debit app: emvtool --redact appdata 0 Selected application "Visa Debit" ([A0 00 00 00 03 10 10]) ┌Processing Options────────────────────────────┐ │ Key │ Value │ ├─────┼────────────────────────────────────────┤ │ AIP │ [60, 0] │ │ AFL │ [8, 1, 1, 0, 16, 1, 2, 0, 24, 1, 3, 2] │ └─────┴────────────────────────────────────────┘ ┌Application Data────────────────────────────────────────────────────┬──────────────────────────────────────────────────────────────────────────────────┐ │ Tag │ Name │ Value │ ├─────────┼──────────────────────────────────────────────────────────┼──────────────────────────────────────────────────────────────────────────────────┤ │ [5F 20] │ Cardholder Name │ "BUTCHER /C.MR" │ │ [57] │ Track 2 Equivalent Data │ [REDACTED] │ │ [9F 1F] │ Track 1 Discretionary Data │ [REDACTED] │ │ [E0] │ │ { 01: [90 81 B0 84 C1 15 15 F4], 7D: { 5C: [43 90 38 68 82 C9 7C A8 4F 87 E1 1E │ │ │ │ EE 53 04 62 60 9B 0F D9 AB F5 A4 7C E1 D4 17 11 EF 00 87 51 11 51 16 62 A7 73 00 │ │ │ │ 10 2F 4F 3D C5 9D CD 20 E3 50 FE BC BE 28 35 2F A2 C0 A6 27 24 DB 02 FC 7F 23 A5 │ │ │ │ D0 5A 9C D1 16 A6 50 0B AC 75 7A A8 A7 65 F4 ED 64 1B 0A 2C 0A]}, (8E) │ │ │ │ Cardholder Verification Method (CVM) List: <CVM List x: None, y: None, rules: >, │ │ │ │ B4: { (8A) Authorisation Response Code: [FF 90 03 C0 71 5E F5 5C 21 BB AA 2F 6E │ │ │ │ 0C 0A F6 98]}} │ │ [5F 25] │ Application Effective Date │ 18/02/01 │ │ [5F 24] │ Application Expiration Date │ 21/02/28 │ │ [5A] │ Application Primary Account Number (PAN) │ [REDACTED] │ │ [5F 34] │ Application Primary Account Number (PAN) Sequence Number │ 0 │ │ [9F 07] │ Application Usage Control │ <AUC: Valid for domestic cash transactions, Valid for international cash │ │ │ │ transactions, Valid for domestic goods, Valid for international goods, Valid for │ │ │ │ domestic services, Valid for international services, Valid at ATMs, Valid at │ │ │ │ terminals other than ATMs> │ │ [9F 0D] │ Issuer Action Code - Default │ [B8 60 6C 08 00] │ │ [9F 0E] │ Issuer Action Code - Denial │ [00 10 80 00 00] │ │ [9F 0F] │ Issuer Action Code - Online │ [B8 68 7C 98 00] │ │ [5F 28] │ Issuer Country Code │ GB │ │ [9F 42] │ Application Currency Code │ GBP │ │ [9F 44] │ Application Currency Exponent │ 2 │ │ [8E] │ Cardholder Verification Method (CVM) List │ <CVM List x: 0, y: 0, rules: If terminal supports the CVM, Plaintext PIN │ │ │ │ verification performed by ICC. Else, fail verification.; If terminal supports │ │ │ │ the CVM, Enciphered PIN verified online; If terminal supports the CVM, │ │ │ │ Enciphered PIN verified online; If terminal supports the CVM, Plaintext PIN │ │ │ │ verification performed by ICC> │ │ [9F 4A] │ Static Data Authentication Tag List │ [(82) Application Interchange Profile] │ └─────────┴──────────────────────────────────────────────────────────┴──────────────────────────────────────────────────────────────────────────────────┘ c

You wrote:

Whoops! Thank you.

If you ever do get it cracked I guess the same method will also work for other UK banks, given that the card readers seem to be interchangeable. One lives and learns, and we made some progress, so thanks for all your help with this. Now I might have a go at Barclayscrape… Very best Charles