I worked on a research project in undergrad that used Reed-Solomon -- we showed a series of images to users, who would later pick those images out of a set of un-trained images in order to authenticate or access some privileged data, sans encryption. the error-correcting allowed for some degree of misremembering or forgetfulness, as is normal in human image recognition tasks.

The professor later spun up a startup that has since been acquired by Dropbox, but I'm unaware what kind of product they're currently working on.