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Tools/Key Block Decoder
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Cryptography & KeysAvailable
Key Block Decoder
Parse TR-31 key blocks — inspect the header fields, key usage, algorithm, mode, exportability, and optional blocks without the Key Block Protection Key.
Follows ANSI X9 TR-31:2018 / X9.143 key block headerversions A, B, C, D — parse only·verified Oct 2026· double-checked Oct 2026— header parser checked against the TR-31:2018 Annex A examples
Use test data only. All calculations run locally in your browser — PayProbe never sees, transmits, or stores your PAN, CVV, keys, PINs, or cryptographic inputs. How we handle data →
Something wrong or missing? Report a problem— we check reports against the specs and fix them.