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doc/GrcardSIM1-notes article written
author Mychaela Falconia <falcon@freecalypso.org>
date Wed, 07 Apr 2021 05:18:17 +0000
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children 9de2d8b8951d
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5f7377392211 doc/GrcardSIM1-notes article written
Mychaela Falconia <falcon@freecalypso.org>
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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:
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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:
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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>
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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:
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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>
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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:
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7 these original GrcardSIM1 cards are extremely scarce: Mother Mychaela got one
5f7377392211 doc/GrcardSIM1-notes article written
Mychaela Falconia <falcon@freecalypso.org>
parents:
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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:
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9 have one or two cards, but that's it - an extreme rarity.
5f7377392211 doc/GrcardSIM1-notes article written
Mychaela Falconia <falcon@freecalypso.org>
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10
5f7377392211 doc/GrcardSIM1-notes article written
Mychaela Falconia <falcon@freecalypso.org>
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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>
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12 interesting: supposedly they are freely reformattable, meaning that any
5f7377392211 doc/GrcardSIM1-notes article written
Mychaela Falconia <falcon@freecalypso.org>
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13 individual card owner can completely erase the card file system and then
5f7377392211 doc/GrcardSIM1-notes article written
Mychaela Falconia <falcon@freecalypso.org>
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14 recreate an entirely new one according to her liking: see our
5f7377392211 doc/GrcardSIM1-notes article written
Mychaela Falconia <falcon@freecalypso.org>
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15 Formatting-thoughts article. However, I said "supposedly" in the previous
5f7377392211 doc/GrcardSIM1-notes article written
Mychaela Falconia <falcon@freecalypso.org>
parents:
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16 sentence, referring to GrcardSIM1 free reformatting ability, because the extreme
5f7377392211 doc/GrcardSIM1-notes article written
Mychaela Falconia <falcon@freecalypso.org>
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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:
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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:
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19 this card via incorrectly-guessed formatting commands, and there does not seem
5f7377392211 doc/GrcardSIM1-notes article written
Mychaela Falconia <falcon@freecalypso.org>
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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>
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21 longer available.
5f7377392211 doc/GrcardSIM1-notes article written
Mychaela Falconia <falcon@freecalypso.org>
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22
5f7377392211 doc/GrcardSIM1-notes article written
Mychaela Falconia <falcon@freecalypso.org>
parents:
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23 Aside from their unique reformatting feature, GrcardSIM1 cards have two very
5f7377392211 doc/GrcardSIM1-notes article written
Mychaela Falconia <falcon@freecalypso.org>
parents:
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24 notable defects compared to current GrcardSIM2 or FCSIM1:
5f7377392211 doc/GrcardSIM1-notes article written
Mychaela Falconia <falcon@freecalypso.org>
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25
5f7377392211 doc/GrcardSIM1-notes article written
Mychaela Falconia <falcon@freecalypso.org>
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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:
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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:
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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:
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29 unauthenticated, meaning that all PIN security is trivially bypassable: you
5f7377392211 doc/GrcardSIM1-notes article written
Mychaela Falconia <falcon@freecalypso.org>
parents:
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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>
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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:
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32 and the GSM authentication token which the hapless owner sought to protect
5f7377392211 doc/GrcardSIM1-notes article written
Mychaela Falconia <falcon@freecalypso.org>
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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:
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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:
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35 4444444444444444 with grcard1-set-adm2 and give yourself full admin write
5f7377392211 doc/GrcardSIM1-notes article written
Mychaela Falconia <falcon@freecalypso.org>
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36 access, without ever knowing the previous key.
5f7377392211 doc/GrcardSIM1-notes article written
Mychaela Falconia <falcon@freecalypso.org>
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37
5f7377392211 doc/GrcardSIM1-notes article written
Mychaela Falconia <falcon@freecalypso.org>
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38 * GrcardSIM2 (FCSIM1) cards support F=512 D=8 speed enhancement (the classic
5f7377392211 doc/GrcardSIM1-notes article written
Mychaela Falconia <falcon@freecalypso.org>
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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:
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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>
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41 slowest F=372 D=1 mode.