FreeCalypso > hg > fc-sim-tools
changeset 74:9de2d8b8951d
doc/GrcardSIM1-notes: add note about Ki
| author | Mychaela Falconia <falcon@freecalypso.org> |
|---|---|
| date | Wed, 07 Apr 2021 05:57:44 +0000 |
| parents | 4ebd67176b73 |
| children | 42229bec887b |
| files | doc/GrcardSIM1-notes |
| diffstat | 1 files changed, 9 insertions(+), 0 deletions(-) [+] |
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--- a/doc/GrcardSIM1-notes Wed Apr 07 05:49:32 2021 +0000 +++ b/doc/GrcardSIM1-notes Wed Apr 07 05:57:44 2021 +0000 @@ -39,3 +39,12 @@ SIM speed enhancement specified in GSM 11.11 and supported by classic GSM/2G phones), but GrcardSIM1 cards don't support it - hence GR1 cards run in the slowest F=372 D=1 mode. + +The only datum on GrcardSIM1 cards which appears to be secure against reading +is Ki. grcard1-set-ki command is unauthenticated like the other grcard1-set-*, +thus anyone can overwrite Ki with their own, but it is a write-only datum on +this card model: it does not appear in the file system, and there is no command +for reading Ki. Contrast with GrcardSIM2, sysmoUSIM-SJS1 and sysmoISIM-SJA2 +cards: all of these cards store their Ki in a special file in their file system, +but this file requires ADM access (SUPER ADM on GrcardSIM2, ADM1 on Sysmocom +cards) for both reading and writing.