Alice and Bob in Love: Cryptographic Communication Using Natural Entropy (draft version)

We propose a protocol for secure communication between two parties who know each other well using only the entropy from their shared life experience. This could enable, for example, lovers or close friends to communicate over a one-way channel without prior key exchange. Our system uses a flexible secret-sharing mechanism to accommodate pieces of personal knowledge of variable entropy and memorability, while still providing reasonable overhead and a high security level.