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README: document C-APDU decoding of secured-packet payloads

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catarrh committed 2026-08-24 22:55:06 +03:00
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@@ -28,7 +28,10 @@ that both captures APDU traffic and serves that PWA.
decryption** of ciphered packets — paste the card's 3DES/AES key in the decryption** of ciphered packets — paste the card's 3DES/AES key in the
detail view to reveal the real CNTR and secured application data (the detail view to reveal the real CNTR and secured application data (the
key stays in the browser, in-memory only; ciphered on-wire CNTR/PCNTR/RC key stays in the browser, in-memory only; ciphered on-wire CNTR/PCNTR/RC
are ciphertext and labeled as such) are ciphertext and labeled as such); the secured application message is
decoded as a stream of **C-APDUs** (SELECT, UPDATE BINARY, …) with
full CLA/INS/P1/P2/Lc/Le breakdown — plaintext immediately, or after
decryption for ciphered packets
- ATR parse (clock-rate conversion, Fi/Di, T-bitmask) and FCP/FCI TLV - ATR parse (clock-rate conversion, Fi/Di, T-bitmask) and FCP/FCI TLV
**simtrace-analyser PWA** ([`frontend/`](frontend/)): **simtrace-analyser PWA** ([`frontend/`](frontend/)):