Electrical computers and digital processing systems: support – Data processing protection using cryptography
Reexamination Certificate
2005-06-30
2009-06-16
Song, Hosuk (Department: 2435)
Electrical computers and digital processing systems: support
Data processing protection using cryptography
C713S181000, C380S217000
Reexamination Certificate
active
07549058
ABSTRACT:
A method and apparatus for encrypting and decrypting digital data employing multiple Huffman tables and at least one encryption key to enhance security of the digital data. At least one image parameter for characterizing the digital data, such as a motion vector table or DC-luminance, is selected as an image parameter. All possible Huffman tables according to the image parameter are then generated by Huffman tree mutation. A predetermined number of active Huffman tables from all possible Huffman tables are selected using a first encryption key and a hash function. Afterward, a coding sequence for the active Huffman tables is generated using a second encryption key and the hash function. Finally, the digital data is encrypted into an encrypted bit stream by the active Huffman tables with the coding sequence. Encrypted symbols of the image parameter can be reduced by symbol statistic analysis, thus reducing computation effort.
REFERENCES:
patent: 4646061 (1987-02-01), Bledsoe
patent: 4897717 (1990-01-01), Hamilton et al.
Dahua Xie and C.-C. Jay Kuo, Enhanced Multiple Huffman Table (MHT) Encryption Scheme Using Key Hopping, IEEE, V-568-V-571, 2004.
Chung-Ping Wu and C.-C. Jay Kuo, Design of Integrated Multimedia Compression and Encryption Systems.
Kuo C.-C. Jay
Shih Hsuan-Huei
Wang Bei
Yeh Chia-Hung
Baker & McKenzie LLP
MAVs Lab. Inc.
Song Hosuk
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