System Architecture

We propose Déjà Vu as a system for user authentication. Déjà Vu is based on the observation that people have an excellent memory for images [Hab70, SCH70, Int80, PC69].

Using Déjà Vu, the user creates an image portfolio, by selecting a subset of $p$ images out of a set of sample images. To authenticate the user, the system presents a challenge set, consisting of $n$ images. This challenge contains $m$ images out of the portfolio. We call the remaining $n-m$ images decoy images. To authenticate, the user must correctly identify the images which are part of her portfolio.

Déjà Vu has three phases: portfolio creation, training, and authentication.