An image is some bits. How do you enter it? Copy and paste? Why not just use a cryptographic key, as mentioned by another user. If the image needs to be exa

An image is some bits. How do you enter it? Copy and paste? Why not just use a cryptographic key, as mentioned by another user. If the image needs to be exact then JPEG compression will be a horror show; many people copy images by taking a lossy screenshot. If it's more like a barcode or QR code (and JPEG resistant) that actually just encodes the real password, you're still relying on a camera, or the ability to copy-paste image data. This probably runs against the grain with what most users expect. I've never had to use an image file or webcam stream as a password before. I'd probably muddle through; but I'm not sure my mother would. That said, I wouldn't mind more passwords and one-time-keys especially on printed materials coming as QR codes. Why do I need to type in a 24 character key from a gift card?