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CAVV Decoder

Decode Cardholder Authentication Verification Value (3D Secure) — Visa CAVV Usage 3, Version 7

🔐 Input

Enter a 28-character Base64 string or 40-character hex string (20 bytes). Spaces in hex are OK.

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📖 About This Tool

What is the CAVV Decoder?

The CAVV Decoder parses Cardholder Authentication Verification Value data used in Visa 3D Secure authentication. It breaks down the CAVV into its component fields including authentication method, key indicator, and cryptographic values.

🛠️ How to Use
  1. Enter the CAVV value (40 hex characters or 28 Base64 characters).
  2. Click Decode to parse all component fields.
❓ FAQ

What is CAVV?

CAVV (Cardholder Authentication Verification Value) is a Visa-specific cryptographic value generated during 3D Secure authentication that proves the cardholder was verified. It is carried in ISO 8583 Field 44 or the Authorization Request.