« Back to FAQ

What is the signature and catchphrase for?

The VNC Server dialog displays a unique digital signature designed to help keep you safe online. This is a hexadecimal representation of a 2048-bit RSA public key hash, which (in the real world) means it’s a six-word memorable catchphrase, for example “Vibrate antenna Sherman. Aspect between Nancy”.


You’ll be asked to verify your catchphrase the first time you connect. If you’re subsequently warned that the catchphrase has changed, it might indicate that someone has tampered with the remote computer, or is trying to intercept your connection (a ‘man-in-the-middle’ attack).