Stephen R. Hanna

Methods and systems for establishing a shared secret using an authentication token

Multiple ACK windows providing congestion control in reliable multicast protocol

Replacing an email attachment with an address specifying where the attachment is stored

Method and apparatus for multicast indication of group key change

Method and apparatus for using non-secure file servers for secure information storage

Method and system for providing limited access privileges with an untrusted terminal

Authentication system and process

Trust ratings in group credentials

Detecting congestion by comparing successive loss of packets in windows to provide congestion control in reliable multicast protocol

Dynamic optimization for receivers using distance between a repair head and a member station in a repair group for receivers having a closely knit topological arrangement to locate repair heads near the member stations which they serve in tree based repair in reliable multicast protocol