Abstract: A multi-level security system includes a storage medium partitionable into a plurality of partitions, a file system coupleable to the plurality of partitions, and a plurality of enclaves. Each enclave is assigned a security classification level. Each enclave resides in a different storage partition of the storage medium. Data stored on the storage medium is cryptographically separated at rest on a per-enclave basis. Cryptographic separation occurs at the disk block level, allowing individual blocks to be read and decrypted. The system also includes a reference monitor that enforces a system security policy that governs access to information between the enclaves. The reference monitor allows an enclave having a first classification level to securely read-down to an enclave having a second classification level lower than the first classification level and to write to another enclave having the first classification level.

Abstract: A multi-level security system includes a storage medium partitionable into a plurality of partitions, a file system coupleable to the plurality of partitions, and a plurality of enclaves. Each enclave is assigned a security classification level. Each enclave resides in a different storage partition of the storage medium. Data stored on the storage medium is cryptographically separated at rest on a per-enclave basis. Cryptographic separation occurs at the disk block level, allowing individual blocks to be read and decrypted. The system also includes a reference monitor that enforces a system security policy that governs access to information between the enclaves. The reference monitor allows an enclave having a first classification level to securely read-down to an enclave having a second classification level lower than the first classification level and to write to another enclave having the first classification level.

Abstract: An adjustable occipital plate includes a central body portion having a plurality of arms extending therefrom in a generally Y-shaped configuration. Two of the arms include elongate slots for slidably receiving retaining members therein. Each retaining member includes a U-shaped channel for receiving a spine rod and a set screw. The central body portion and one arm include openings for receiving bone screws therein. Each of the arms may be angled with respect to the central body portion.

Abstract: An adjustable occipital plate includes a central body portion having a plurality of arms extending therefrom in a generally Y-shaped configuration. Two of the arms include elongate slots for slidably receiving retaining members therein. Each retaining member includes a U-shaped channel for receiving a spine rod and a set screw. The central body portion and one arm include openings for receiving bone screws therein. Each of the arms may be angled with respect to the central body portion.

Abstract: An adjustable occipital plate includes a central body portion having a plurality of arms extending therefrom in a generally Y-shaped configuration. Two of the arms include elongate slots for slidably receiving retaining members therein. Each retaining member includes a U-shaped channel for receiving a spine rod and a set screw. The central body portion and one arm include openings for receiving bone screws therein. Each of the arms may be angled with respect to the central body portion.