Method and apparatus for encrypting and decrypting digital data

A computer-useable medium having computer-readable program code executable to implement a method for encrypting digital data, the method comprising:

• selecting at least one image parameter for characterizing the digital data;
• generating all possible Huffman tables according to the image parameter;
• randomly selecting a predetermined number of active Huffman tables from all possible Huffman tables using a first encryption key;
• generating a coding sequence for the active Huffman tables using a second encryption key;
• and
• encrypting the digital data into an encrypted bit stream by the active Huffman tables with the coding sequence.

An encoding system for encoding digital data, the encoding system comprising:

• a network-connected computer configured to provide digital data via digital bit streams to a client computer;
• an encryption encoder associated with the network-connected computer for encrypting the digital data, the encryption encoder being a computer program product comprising a computer-useable medium having computer-readable program code executable to implement a method for encrypting the digital data, the method comprising:
• selecting at least one image parameter for characterizing the digital data, the image parameter containing a first number of symbols;
• selecting a second number of symbols from the image parameter based on a symbol statistic analysis of the image parameter, wherein the second number is less than the first number;
• generating all possible Huffman tables according to the selected symbols;
• randomly selecting a predetermined number of active Huffman tables from all possible Huffman tables using a first encryption key;
• generating a coding sequence for the active Huffman tables using a second encryption key;
• and
• encrypting the digital data into an encrypted bit stream by the active Huffman tables with the coding sequence;
• and
• wherein the network-connected computer is further configured to transmit the encrypted bit stream to the client computer.

An encoding system for encoding digital data, the encoding system comprising:

• a network-connected computer configured to provide digital data via digital bit streams to a client computer;
• an encryption encoder associated with the network-connected computer for encrypting the digital data, the encryption encoder being a computer program product comprising a computer-useable medium having computer-readable program code executable to implement a method for encrypting the digital data, the method comprising:
• selecting at least one image parameter for characterizing the digital data;
• generating all possible Huffman tables according to the image parameter;
• randomly selecting a predetermined number of active Huffman tables from all possible Huffman tables using a first encryption key;
• generating a coding sequence for the active Huffman tables using a second encryption key;
• and
• encrypting the digital data into an encrypted bit stream by the active Huffman tables with the coding sequence;
• and
• wherein the network-connected computer is further configured to transmit the encrypted bit stream to the client computer.