Apparatus and method for an iterative cryptographic block

Details Apparatus and method for an iterative cryptographic block Apparatus and method for an iterative cryptographic block

2008-04-29

2008-04-29

Moazzami, Nasser (Department: 2136)

Cryptography

Video cryptography

Video electric signal modification

C380S268000, C380S042000, C380S044000, C726S018000, C726S019000

Reexamination Certificate

active

10801962

ABSTRACT:
A method and apparatus for an iterative cryptographic block under the control of a CPU and without a fixed number of stages. In one embodiment, a first cryptographic block descrambles received information using an internal key or a preprogrammed key to form a descrambled key or descrambled data. A data feedback path stores the descrambled data as internal data and provides the internal data or the external data as data input to the first cryptographic block. A key feedback path stores the descrambled key as an internal key and provides the internal key or the preprogrammed key to a key input of the first cryptographic block. A second cryptographic block descrambles received content using a final descrambling key. Other embodiments are described and claimed.

REFERENCES:
patent: 5619576 (1997-04-01), Shaw
patent: 5751811 (1998-05-01), Magnotti et al.
patent: 5825879 (1998-10-01), Davis
patent: 6192129 (2001-02-01), Coppersmith et al.
patent: 6307936 (2001-10-01), Ober et al.
patent: 6333983 (2001-12-01), Enichen et al.
patent: 6704871 (2004-03-01), Kaplan et al.
patent: 7242772 (2007-07-01), Tehranchi
patent: 0 766 424 (1997-04-01), None
patent: WO 97/05720 (1997-02-01), None
Yu, H., et ak, ‘Progressive and scalable encryption for multimedia content access control’, IEEE 2003, 0-7803-7802-4/03, entire document, http://ieeexplore.ieee.org/iel5/8564/27113/01204236.pdf.

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