FreeCalypso > hg > fc-sim-tools

annotate doc/GrcardSIM1-notes @ 74:9de2d8b8951d

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
doc/GrcardSIM1-notes: add note about Ki
author Mychaela Falconia <falcon@freecalypso.org>
date Wed, 07 Apr 2021 05:57:44 +0000
parents 5f7377392211
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
72
5f7377392211 doc/GrcardSIM1-notes article written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
1 As of A.D. 2021, the GSM-only SIM card model (as opposed to USIM/ISIM for LTE/5G
5f7377392211 doc/GrcardSIM1-notes article written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
2 users) sold by Grcard company is the one which we call GrcardSIM2 - our current
5f7377392211 doc/GrcardSIM1-notes article written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
3 FCSIM1 cards are GrcardSIM2, and this card model goes back to some time around
5f7377392211 doc/GrcardSIM1-notes article written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
4 2013, when it was sold by Sysmocom as sysmoSIM-GR2. However, if we go back in
5f7377392211 doc/GrcardSIM1-notes article written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
5 time a little further to around 2011, Grcard had an earlier card model which we
5f7377392211 doc/GrcardSIM1-notes article written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
6 call GrcardSIM1 - it was sold by Sysmocom as sysmoSIM-GR1. In the present day
5f7377392211 doc/GrcardSIM1-notes article written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
7 these original GrcardSIM1 cards are extremely scarce: Mother Mychaela got one
5f7377392211 doc/GrcardSIM1-notes article written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
8 card from Das Signal, there may be one or two other people on the planet who
5f7377392211 doc/GrcardSIM1-notes article written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
9 have one or two cards, but that's it - an extreme rarity.
5f7377392211 doc/GrcardSIM1-notes article written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
10
5f7377392211 doc/GrcardSIM1-notes article written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
11 These GrcardSIM1 cards have one and only one special feature that makes them
5f7377392211 doc/GrcardSIM1-notes article written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
12 interesting: supposedly they are freely reformattable, meaning that any
5f7377392211 doc/GrcardSIM1-notes article written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
13 individual card owner can completely erase the card file system and then
5f7377392211 doc/GrcardSIM1-notes article written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
14 recreate an entirely new one according to her liking: see our
5f7377392211 doc/GrcardSIM1-notes article written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
15 Formatting-thoughts article. However, I said "supposedly" in the previous
5f7377392211 doc/GrcardSIM1-notes article written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
16 sentence, referring to GrcardSIM1 free reformatting ability, because the extreme
5f7377392211 doc/GrcardSIM1-notes article written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
17 scarcity makes it too difficult to test this ability: I (Mother Mychaela) have
5f7377392211 doc/GrcardSIM1-notes article written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
18 only one card to play with, I am not too keen on the idea of possibly bricking
5f7377392211 doc/GrcardSIM1-notes article written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
19 this card via incorrectly-guessed formatting commands, and there does not seem
5f7377392211 doc/GrcardSIM1-notes article written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
20 to be much point in developing formatting tools for a card model that is no
5f7377392211 doc/GrcardSIM1-notes article written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
21 longer available.
5f7377392211 doc/GrcardSIM1-notes article written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
22
5f7377392211 doc/GrcardSIM1-notes article written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
23 Aside from their unique reformatting feature, GrcardSIM1 cards have two very
5f7377392211 doc/GrcardSIM1-notes article written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
24 notable defects compared to current GrcardSIM2 or FCSIM1:
5f7377392211 doc/GrcardSIM1-notes article written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
25
5f7377392211 doc/GrcardSIM1-notes article written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
26 * GrcardSIM1 cards have a broken security model in that grcard1-set-pin1,
5f7377392211 doc/GrcardSIM1-notes article written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
27 grcard1-set-pin2, grcard1-set-adm1 and grcard1-set-adm2 commands (or rather
5f7377392211 doc/GrcardSIM1-notes article written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
28 the actual command APDUs sent by these fc-simtool commands) are completely
5f7377392211 doc/GrcardSIM1-notes article written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
29 unauthenticated, meaning that all PIN security is trivially bypassable: you
5f7377392211 doc/GrcardSIM1-notes article written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
30 can take a PIN-locked card for which you don't know the PIN, you can reset
5f7377392211 doc/GrcardSIM1-notes article written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
31 its PIN with grcard1-set-pin1, and bingo, you have access to all private data
5f7377392211 doc/GrcardSIM1-notes article written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
32 and the GSM authentication token which the hapless owner sought to protect
5f7377392211 doc/GrcardSIM1-notes article written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
33 with their PIN. The same goes for ADM access: if someone set the card's ADM2
5f7377392211 doc/GrcardSIM1-notes article written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
34 key to some unknown secret, you can reset it back to the pySim default of
5f7377392211 doc/GrcardSIM1-notes article written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
35 4444444444444444 with grcard1-set-adm2 and give yourself full admin write
5f7377392211 doc/GrcardSIM1-notes article written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
36 access, without ever knowing the previous key.
5f7377392211 doc/GrcardSIM1-notes article written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
37
5f7377392211 doc/GrcardSIM1-notes article written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
38 * GrcardSIM2 (FCSIM1) cards support F=512 D=8 speed enhancement (the classic
5f7377392211 doc/GrcardSIM1-notes article written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
39 SIM speed enhancement specified in GSM 11.11 and supported by classic GSM/2G
5f7377392211 doc/GrcardSIM1-notes article written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
40 phones), but GrcardSIM1 cards don't support it - hence GR1 cards run in the
5f7377392211 doc/GrcardSIM1-notes article written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
41 slowest F=372 D=1 mode.
74
9de2d8b8951d doc/GrcardSIM1-notes: add note about Ki
Mychaela Falconia <falcon@freecalypso.org>
parents: 72
diff changeset
42
9de2d8b8951d doc/GrcardSIM1-notes: add note about Ki
Mychaela Falconia <falcon@freecalypso.org>
parents: 72
diff changeset
43 The only datum on GrcardSIM1 cards which appears to be secure against reading
9de2d8b8951d doc/GrcardSIM1-notes: add note about Ki
Mychaela Falconia <falcon@freecalypso.org>
parents: 72
diff changeset
44 is Ki. grcard1-set-ki command is unauthenticated like the other grcard1-set-*,
9de2d8b8951d doc/GrcardSIM1-notes: add note about Ki
Mychaela Falconia <falcon@freecalypso.org>
parents: 72
diff changeset
45 thus anyone can overwrite Ki with their own, but it is a write-only datum on
9de2d8b8951d doc/GrcardSIM1-notes: add note about Ki
Mychaela Falconia <falcon@freecalypso.org>
parents: 72
diff changeset
46 this card model: it does not appear in the file system, and there is no command
9de2d8b8951d doc/GrcardSIM1-notes: add note about Ki
Mychaela Falconia <falcon@freecalypso.org>
parents: 72
diff changeset
47 for reading Ki. Contrast with GrcardSIM2, sysmoUSIM-SJS1 and sysmoISIM-SJA2
9de2d8b8951d doc/GrcardSIM1-notes: add note about Ki
Mychaela Falconia <falcon@freecalypso.org>
parents: 72
diff changeset
48 cards: all of these cards store their Ki in a special file in their file system,
9de2d8b8951d doc/GrcardSIM1-notes: add note about Ki
Mychaela Falconia <falcon@freecalypso.org>
parents: 72
diff changeset
49 but this file requires ADM access (SUPER ADM on GrcardSIM2, ADM1 on Sysmocom
9de2d8b8951d doc/GrcardSIM1-notes: add note about Ki
Mychaela Falconia <falcon@freecalypso.org>
parents: 72
diff changeset
50 cards) for both reading and writing.