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doc/Sniffing-workflow: document simsniff-dec
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 21 Sep 2023 06:47:03 +0000
parents 1068f9fd41d5
children
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48:1068f9fd41d5 49:7e87b03dd57d
55 APDU exchanges. Did the card ask for data transfer in one swoop or one byte at 55 APDU exchanges. Did the card ask for data transfer in one swoop or one byte at
56 a time? Did it use any stalling bytes, and how many? All of these lowest-level 56 a time? Did it use any stalling bytes, and how many? All of these lowest-level
57 details might matter when trying to solve the mystery of why vintage phone model 57 details might matter when trying to solve the mystery of why vintage phone model
58 ABC seemingly-inexplicably refuses to work with SIM card model XYZ! 58 ABC seemingly-inexplicably refuses to work with SIM card model XYZ!
59 59
60 There will also be a higher-level decoding program, tentatively named 60 Once you have the log captured, decode it as follows:
61 simtrace3-sniff-dec. This program will read log files written by 61
62 simtrace3-sniff-rx and decode them into slightly-higher-level elements as in 62 simsniff-dec logfile
63 ATR, PPS exchanges, command headers, data transfers and status bytes. 63
64 This program reads log files written by simsniff-rx and decodes them into
65 higher-level elements as in ATR, PPS exchanges, command headers, data transfers
66 and status bytes. You should now be able to see what the ME is requesting from
67 the SIM and how the SIM responds - hopefully enough insight to figure out why
68 the finicky phone accepts some SIMs but rejects others.