# Online KCV Calculator

DES or 3DES key in hexadecimal:

The Key Checksum Value (KCV) is used to verify a cryptographic key. The input key is assumed to be either DES or 3DES. The KCV is computed by encrypting a block of binary zeroes and extracting the first 6 hexadecimal digits.

Note that it is never recommended to input a real cryptographic key into an online tool. You can save this page and run it locally to avoid exchanging any sensitive information over the Internet.

A valid DES or 3DES key must be 8, 16 or 24 bytes long, which means that the key length in hexadecimal characters must be 16, 32 or 48. For example, a valid DES key: 0123456789ABCDEF