Encrypted Huffman encoding method and decoding method

An encoding method and an encoding technology, which are applied in the fields of information security and digital content protection, can solve problems such as the impact of encoding length, MHT insecurity, and inability to resist synchronization attacks, and achieve the effects of increasing key space, improving performance, and high efficiency
CN101465724AInactive Publication Date: 2009-06-24INST OF SOFTWARE - CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
INST OF SOFTWARE - CHINESE ACAD OF SCI
Publication Date
2009-06-24
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses an encrypted Huffman coding method and decoding method thereof, which belong to information security and digital content protection technical field. The coding method includes that a) a coding unit sequence is obtained according to coded content; b) as for coding units, encrypted disturbance is performed on part of coding nodes in Huffman coding tree, and code words of the coding units are obtained according to the disturbed Huffman coding tree; c) code words are sequentially combined to acquire coding result. The decoding method includes that a) as for code words in coding result, encrypted disturbance which is the same with that in coding process is performed on the Huffman coding tree, and coding units of the code words are obtained according to the disturbed Huffman coding tree; b) the coding units are sequentially combined to acquire the content before the coding process. The encrypted Huffman coding method and decoding method can be applicable to digital content protection, in particular to text, image, audio and video protection; the encrypted Huffman coding method and decoding method can effectively resist chosen-plaintext attack and have low encryption cost, and can ensure the coding length to be constant and embed compression coding process in a seamless way.
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