mfkdf.com

mfkdf.com is a live English-language website hosted on Cloudflare, Inc. (AS13335) in the United States, served by Cloudflare. cl0q first saw it on 2026-07-09 and last crawled it on 2026-07-09. It resolves to 104.21.56.163 and has mail (MX) records set up. Its favicon is fingerprinted by SHA-256, so you can find every other site that serves the same icon.

How the site describes itself:

Multi-Factor Key Derivation Function (MFKDF2) by Multifactor

The Next-Generation Multi-Factor Key Derivation Function (MFKDF2) is a function that takes multiple inputs and outputs a string of bytes that can be used as a cryptographic key. It serves the same purpose as a password-based key derivation function (PBKDF), but is stronger than password-based key derivation due to its support for multiple authentication factors, including HOTP, TOTP, and hardware tokens like YubiKey. MFKDF also enables self-service account recovery via K-of-N (secret-sharing style) key derivation, eliminating the need for central recovery keys, and supports arbitrarily complex key derivation policies.