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comparison doc/GrcardSIM1-notes @ 74:9de2d8b8951d

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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
comparison
equal deleted inserted replaced
73:4ebd67176b73 74:9de2d8b8951d
37 37
38 * GrcardSIM2 (FCSIM1) cards support F=512 D=8 speed enhancement (the classic 38 * GrcardSIM2 (FCSIM1) cards support F=512 D=8 speed enhancement (the classic
39 SIM speed enhancement specified in GSM 11.11 and supported by classic GSM/2G 39 SIM speed enhancement specified in GSM 11.11 and supported by classic GSM/2G
40 phones), but GrcardSIM1 cards don't support it - hence GR1 cards run in the 40 phones), but GrcardSIM1 cards don't support it - hence GR1 cards run in the
41 slowest F=372 D=1 mode. 41 slowest F=372 D=1 mode.
42
43 The only datum on GrcardSIM1 cards which appears to be secure against reading
44 is Ki. grcard1-set-ki command is unauthenticated like the other grcard1-set-*,
45 thus anyone can overwrite Ki with their own, but it is a write-only datum on
46 this card model: it does not appear in the file system, and there is no command
47 for reading Ki. Contrast with GrcardSIM2, sysmoUSIM-SJS1 and sysmoISIM-SJA2
48 cards: all of these cards store their Ki in a special file in their file system,
49 but this file requires ADM access (SUPER ADM on GrcardSIM2, ADM1 on Sysmocom
50 cards) for both reading and writing.