Massachusetts Institute of Technology

Joshua Kramer

Mankuan Michael Vai

Daniil M Utin

Roger I Khazan

David Whelihan

Michael W Geis

Theodore M Lyszczarz

Marc J Burke

Karen M G V Gettings

Karen Mgv Gettings

An improved waveguide is disclosed. The waveguide utilizes a luminescent material disposed within or around its perimeter to introduce additional light into the waveguide. For example, the waveguide may include a plurality of planar layers having different refractive indexes. A luminescent material may be disposed along the outer edge of these layers. When light from within the waveguide strikes the luminescent material, it emits light, thereby adding to the light in the waveguide. Not only does the luminescent material introduce more light into the waveguide, it also introduces more light sources, thereby making it more difficult to introduce a probe without blocking at least a portion of the light destined for the image sensor. The luminescent material may be a phosphor.

Phosphor-loaded waveguide

A circuit for secure operation includes a plurality of mutually exclusive circuit zones including a first circuit zone having a first level of security and a second circuit zone having a second level of security less than the first level of security and one or more gate circuits each providing limited transfer of data between the circuit zones, the gate circuits providing all data connectivity between the first circuit zone and the second circuit zone and statically configured to prevent unmodified transfer of data from the first circuit zone to the second circuit zone.

Data security using inter-zone gate circuits

A method for operating a secure device having a plurality of mutually exclusive circuit zones, including a first circuit zone having a first level of security and a second circuit zone having a second level of security less than the first level of security, the method including unpacking a key exchange package including receiving a key exchange package in the second circuit zone, the key exchange package including encrypted key data and processing the encrypted key data using a content key in the first circuit zone to generate decrypted key data and storing the decrypted key data in the first circuit zone without disclosing the decrypted key data into the second circuit zone.

Cryptography and key management device verification

Cryptography and key management device and architecture

Growing community of inventors

Burlington, MA, United States of America

Joshua Kramer