Scrambling a compression-coded signal

Details Scrambling a compression-coded signal Scrambling a compression-coded signal

2005-04-26

2005-04-26

Barrón, Gilberto (Department: 2132)

Cryptography

Communication system using cryptography

Having compression

C380S217000, C380S046000, C380S028000, C708S203000

Reexamination Certificate

active

06885749

ABSTRACT:
This invention provides methods and apparatus for protecting data transmitted using standard compression techniques such as Huffman coding. After input data is preprocessed (filtered, quantized, etc.), the data is encoded using a Huffman coder based on Huffman codes or code books which have been scrambled to change the order of the code books and/or codes from established standard Huffman code books and/or codes. When the transmitted information is received by a Huffman code receiver, the received data may be decoded using the scrambled Huffman code book/codes to obtain the data that was transmitted by the transmitter.

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Schneier, Bruce; Applied Cryptography; 1996; John Wiley & Sons, Inc; 2nd Edition; pp. 47-74.

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