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Scriamble apparatus and descramble apparatus

A technology of encryption device and conversion device, which is applied in the direction of secure communication device, digital transmission system, television, etc., can solve the problems of data cannot be reproduced, the degree of influence is different, and the control cannot be properly completed, so as to achieve great encryption effect and brightness and the effect of tone deterioration

Inactive Publication Date: 2004-05-12
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The above-mentioned conventional encryption apparatus has the following problem: When the input signal contains a variable-length code, even the variable-length code portion is transformed into a random bit pattern by the encryption process
As a result, the start position of the next code is found wrongly, and the subsequent data cannot be reproduced.
[0008] Another shortcoming of previous encryption devices is that in the case of compressed coded data, the data is often coded with several parameters, and the degree of influence of different parameters is different when the data is expanded.
Therefore, when the data is randomly encrypted, the control cannot be done properly

Method used

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  • Scriamble apparatus and descramble apparatus
  • Scriamble apparatus and descramble apparatus
  • Scriamble apparatus and descramble apparatus

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no. 1 example

[0077] The operation of the encryption device having the structure described above is described below. Similar to the first embodiment, the encrypting means generates an encrypted signal for a signal conforming to the MPEG standard. The signal is input into the signal processing means 11 of the encryption means.

[0078] FIG. 9 is a block diagram of processing procedures to be executed in the signal processing device 11. As shown in FIG. 9, the signal processing device 11 includes a DCT processing block 16; a digital processing block 17; an inverse digital processing block 18; an inverse DCT processing block 19; a frame memory 20; a frame-by-frame prediction / non-prediction block 21; And motion detection block 22. In the coding method according to the MPEG standard, the signal processing unit 11 includes three frames, namely an intra-coded picture (I) frame for performing intra-frame coding, and a predictively coded picture for performing forward predictive coding based on th...

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Abstract

A scramble apparatus for scrambling data including a variable length code and a descramble apparatus for descrambling a scrambled signal, and a scramble transmission apparatus comprising the scramble apparatus and the descramble apparatus. A specific code of data is converted into a readable code having a length equal to that of an original code.

Description

[0001] This application is a divisional application of the patent application 93116600.4 filed on July 21, 1993, entitled "Encryption Device and Decryption Device". technical field [0002] The present invention relates to an encryption device and a decryption device, which can be used by limited people for encryption and decoding operations that require transmission and storage of digitally encoded signals, and in particular to an encryption device that can effectively control the degree of encryption according to the purpose and for reproduction A decryption device for an encrypted signal, and an encryption transmission device including the encryption device and the decryption device. Background technique [0003] In the past, the effective control of encryption was used for television broadcasting. Regarding encryption means for processing digital signals, encryption of sound signals is described in Television Institution Technical Report Vol. 15, Nol4, pp1-6. [0004] T...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N21/2347H04N7/167H04N7/26H04N7/30H04N21/4405
CPCH04N19/00121H04N19/00951H04N7/26106H04N19/00775H04N7/3022H04N7/1675H04N7/30H04N19/13H04N19/60H04N19/91H04N21/2347H04N21/4405
Inventor 胜田升村上弘规茨木晋中村诚司秋山利秀竹野浩司
Owner PANASONIC CORP