The Form Fields Fingerprint is not to be used as a unique identifier of devices like other fingerprints presented on this site. It's main purpose is to detect miscreants injecting extra form fields into your site. Malware such as SpyEye, Zues, Ice IX and others are capable of injecting additional form fields into your site, with the purpose of stealing data from your clients. By taking a snap shot of what form fields the user sees, you can determine if any of your clients are infected.
How It Works
Entropy Estimate: N/A
Unlike other code on the Internet we do everything possible to verify our code for you. In order to minimize problems and maximize compatibility this code has been verified with JSLint and has been extensively tested with over 1100 OS/Browser combinations using BrowserStack.
Meet Ice IX, Son of Zeus (Aug 28, 2011). In Internet Security. Retrieved September 09, 2017, from http://www.internetsecuritydb.com/2011/08/meet-ice-ix-son-of-zeus.html
VB2014 paper: Protecting financial institutions from man-in-the-browser attacks (Jan 01, 2016). In Virus Bulletin. Retrieved September 09, 2017, from https://www.virusbulletin.com/virusbulletin/2016/01/paper-protecting-financial-institutions-man-browser-attacks/