Quick enciphering method and device for wavelet image

An encryptor and image technology, applied in the field of information security transmission, can solve the problem of reduced algorithm implementation efficiency, regardless of the characteristics of multimedia data, etc., to achieve the effect of strong anti-attack ability, small calculation amount, and improved speed
CN1527249AInactive Publication Date: 2004-09-08NANJING UNIV OF POSTS & TELECOMM
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
NANJING UNIV OF POSTS & TELECOMM
Publication Date
2004-09-08
Estimated Expiration
Not applicable · inactive patent

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Abstract

The present invention relates to method and device for safe information transmission. The quick enciphering device consists of DSP module, FLASH module, power supply managing module and clock module. The enciphering method includes: feeding pre-programmed cipher key via serial port to the enciphering device; feeding the image data flow to the enciphering device via the two-way channel comprising DSP serial port; analyzing the image into LF component and HF detail component; converting the wavelet coefficient of the LF component from floating point number into fixed point number; dividing the wavelet coefficient of the LF component into sub-groups of 128 bit; enciphering the sub-groups successively in AES algorithm; converting the wavelet coefficient of the LF component from fixed point number to floating point number; combining the wavelet coefficient of LF component and HF component to form compressed image file; and outputting the image data flow via the DSP serial port.
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Description

technical field

[0001] The invention relates to a method and device for safe transmission of information, especially an encryption method and a fast encryptor in safe transmission of image information. Background technique

[0002] Due to the continuous improvement of computer computing power and the development of Internet-based distributed computing, it poses a huge threat to the DES algorithm with a key length of only 56 bits. Therefore, on April 15, 1997, the National Institute of Standards and Technology (NIST) launched Solicit activities for the Advanced Encryption Standard (AES) algorithm, and announced Rijndael on October 2, 2000 as a new generation of data encryption standards in the United States, aiming to protect the transmission of sensitive and non-confidential information of the government and other organizations.

[0003] The Rijndael algorithm is an iterative block cipher with a data block length of 128 bits and a variable key length....

Claims

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