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CVV/CVC calculator
Compute a real CVV1, CVV2, and iCVV from the same PAN, expiry, and Card Verification Key — watch all three diverge from one formula, purely because the service code input differs.
What's happening under the hood →·Read the The Data Encryption Standard (DES) module for the full explanation →·See the CVV/CVC: the three digits that never survive an authorization use case →
1. Set up a card and a CVK pair
A demo PAN, expiry (YYMM), and a double-length 3DES Card Verification Key — issuer-held, never the cardholder's.