Methods and apparatus for uniquely end encrypting data

Details Methods and apparatus for uniquely end encrypting data Methods and apparatus for uniquely end encrypting data

H - Electricity

04

L

H04L 9/18 (2006.01) H04L 9/08 (2006.01) H04N 7/167 (2006.01)

Patent

CA 2150825

In a data transmission system comprising a plurality N of transmission sites (22, 24, 28) and at least one reception site (30) a set of data at each transmission site is uniquely encrypted by (a) providing each transmission site (22, 24, 28) with a broadcast key (42, 44, 48) unique to that transmission site and a system key (sk) that is the same for all transmission sites, the system key (sk) comprising a plurality S of bits and each of the broadcast keys comprising a unique plurality B of bits, wherein B is less than S; (b) convolving in a predetermined manner at each transmission site (22, 24, 28) the system key and the broadcast key unique (42, 44, 48) to that transmission site to generate a unique data encryption key for that transmission site; (c) encrypting the set of data at each transmission site (22, 24, 28) with the unique data encryption key (42, 44, 48) generated at that site.

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