Entropy-Coded Multimedia Encryption for Real-Time Wireless Compression
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Solution Overview
Problem
Existing methods for encrypting and compressing multimedia data using MPEG standards, such as DES, are resource-intensive and do not improve the data compression ratio, making them unsuitable for real-time multimedia services on wireless mobile terminals.
Innovation Solution
The method involves creating DCT coefficients, quantizing them, and then encrypting and compressing DC and AC coefficients using entropy encoding with a specific encryption key, followed by Huffman coding, utilizing two symmetric keys for secure decoding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If DES encryption is applied to compressed multimedia data using MPEG standards, then data security is improved, but processing complexity and resource consumption increase
Solution Approach 1:
The patent combines encryption and compression operations into a unified process. The encryption key is integrated into the entropy encoding stage, allowing simultaneous encryption and compression without separate processing steps, thereby reducing overall processing complexity while maintaining security
Solution Approach 2:
The encryption key is prepared and integrated into the compression process beforehand, specifically during the entropy encoding stage. This preliminary integration avoids the need for separate encryption operations on already-compressed data, reducing computational overhead
2Reliability
If traditional encryption methods are used on compressed multimedia data, then data security is improved, but data compression ratio deteriorates
Solution Approach 1:
Encryption and compression are merged into a single integrated process where the encryption key influences the entropy encoding. This prevents the need for separate encryption operations that would expand data size, thereby maintaining optimal compression ratios while ensuring security
3Quantity of substance
If MPEG compression standards are applied to multimedia data, then data compression ratio is improved, but processing complexity increases
Solution Approach 1:
The encryption key is integrated into the entropy encoding stage of MPEG compression, allowing the compression process to simultaneously perform encryption. This eliminates the need for separate encryption operations, reducing overall processing complexity while maintaining compression efficiency
Data Source
AI summary
Disclosed herein is a method and apparatus for encrypting and compressing multimedia data, which transforms and compresses multimedia data through an encryption key in a process of compressing the multimedia data to record and transmit the data, and encrypts the multimedia data to allow the data to be decoded using only the encryption key. The method includes creating Discrete Cosine Transform (DCT) coefficients by applying input multimedia data to a DCT unit, and quantizing the DCT coefficients; encrypting and compressing transformed Differential Coefficients (DC coefficient) and transformed Amplitude Coefficients (AC coefficient) by transforming encoded DC and AC coefficients depending on a certain encryption key at the time of entropy encoding quantized DC and AC coefficients of the quantized DCT coefficients; and Huffmann coding the encrypted DC and AC coefficients and outputting the coded DC and AC coefficients. The method is a data compression method suitable for processing multimedia data for wireless communication.