Keys · Key generation
Key Generation
Generate double-length TDES keys (128-bit), split them into three XOR components, and compute VISA key check values. All operations run locally in your browser.
Double-length TDES key — 16 bytes (32 hex digits)
KCV (VISA)
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Components XOR together to form the combined key:
K = C1 ⊕ C2 ⊕ C3
Component 1
KCV
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Component 2
KCV
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Component 3
KCV
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VISA KCV: encrypt 8 zero bytes with 3DES-ECB using the key; the leftmost 6 hex digits of the ciphertext form the check value.