We describe an encrypted communication principle that forms a secure link between two parties without
electronically saving either of their keys. Instead, random cryptographic bits are kept safe within the unique
mesoscopic randomness of two volumetric scattering materials. We demonstrate how a shared set of
patterned optical probes can generate 10 gigabits of statistically verified randomness between a pair of
unique 2 mm^3 scattering objects. This shared randomness is used to facilitate information-theoretically
secure communication following a modified one-time pad protocol. Benefits of volumetric physical storage
over electronic memory include the inability to probe, duplicate or selectively reset any bits without
fundamentally altering the entire key space. Our ability to securely couple the randomness contained within
two unique physical objects can extend to strengthen hardware required by a variety of cryptographic
protocols, which is currently a critically weak link in the security pipeline of our increasingly mobile
communication culture