Physical layer security manager for memory-mapped serial communi

Details Physical layer security manager for memory-mapped serial communi Physical layer security manager for memory-mapped serial communi

1998-06-26

2000-10-17

Beausoliel, Jr., Robert W.

Electrical computers and digital processing systems: support

Multiple computer communication using cryptography

Protection at a particular protocol layer

713201, 713160, 713161, G06F 1214

Patent

active

061346624

ABSTRACT:
A distributed firewall is utilized in conjunction with a memory-mapped serial communications interface such as that defined by the IEEE 1394 specification to permit secure data transmission between selected nodes over the interface. The distributed firewall incorporates security managers in the selected nodes that are respectively configured to control access to their associated nodes, thereby restricting access to such nodes to only authorized entities. The security manager in at least one of the nodes is implemented in the physical (PHY) layer for the communications interface. The security manager controls access to its associated node by selectively modifying data packets received from unauthorized entities in such a manner that acceptance of the modified data packets by the link layer is inhibited, e.g., by modifying the checksum in a data packet so that, upon receipt by the link layer of the associated node, the data packet is determined to be invalid by the link layer. As a result, the link layer may disregard the data packet so that effectively the unauthorized attempt to access the node is ignored.

REFERENCES:
patent: 6009527 (1999-12-01), Traw et al.
patent: 6061746 (2000-05-01), Stanley et al.
patent: 6061794 (2000-05-01), Angelo et al.
Anderson, Don FireWire System Architecture: IEEE 1394, First Edition, Addison Wesley, MindShare, Inc., 1998.

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