Patent ID: 7305551
Filing Date: 2007-12-04
Classification: H04L

Abstract:
1. A method of transmitting data securely from a source point to a target point in a point-to-multipoint communication network, the method comprising the steps of: (a) forming an encryption tag field including information relating to an encryption tag type indicating whether transmission data is encryption-enabled or encryption-disabled and an encryption tag information field for providing information relating to one of a key synchronization, a version, and an initialization vector (IV) of an optical network unit; (b) forming a packet data field including encrypted transmission data; (c) forming a first integrity check field indicating a CRC (Cyclic Redundancy Check) check sum of the encrypted transmission data; (d) forming a second integrity check field indicating a check sum of the transmission frame and adding the second integrity check field to the transmission frame for a subsequent transmission and, (e) forming a transmission frame including the formed fields from steps (a)-(d), a source address field indicating the address of the source point and a destination address field indicating fine address of the target point.