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Trustful disc driver with data hiding and encrypting function

A technology of optical disc drive and encryption function, which is applied in data recording, instrumentation, information storage, etc., and can solve the problems of hardware encryption of security performance data, inability to achieve data hiding, strong and other problems, and achieve the effect of improving security

Active Publication Date: 2015-11-25
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, software algorithms are usually used to implement traditional optical disc content or data encryption. However, this method is not as powerful as hardware encryption of data in terms of security performance, and it cannot achieve the purpose of data hiding.

Method used

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  • Trustful disc driver with data hiding and encrypting function
  • Trustful disc driver with data hiding and encrypting function
  • Trustful disc driver with data hiding and encrypting function

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] see figure 2 , the original file of Embodiment 1 of the present invention is explained by using a piece of DVD disc physical run sequence (the figure is marked as: A), and the run lengths are: 7T, 7T, 3T, 3T, 9T, 11T, 7T, 7T, 11T and 9T.

[0056] A certain byte is used in the hidden file for illustration (marked as: B in the diagram). In the first embodiment of the present invention, this byte is 0x9E, which is 10011110 after being converted into a binary sequence.

[0057] The encoding method of the sub-pit and sub-bank is as follows: only consider whether to set up a sub-pit or a sub-bank on a DVD physical run length greater than or equal to 7T (defined as a long physical run length), wherein, 1 corresponds to setting a sub-pit or a sub-bank on a long physical run length. Bank, 0 corresponds to no sub-pit or sub-bank on the long physical run, thus forming the composite code or the third recording laser switch signal (marked as: AB in the figure).

Embodiment 2

[0059] In Embodiment 2 of the present invention, the original file is used to describe 90 a physical run sequence of a DVD disc, and the run lengths are 3T, 8T, 10T, 5T, 5T, 7T, and 5T in sequence. Similarly, the encoding method of the sub-pit and sub-land is as follows: the sub-pit or sub-land is set on the DVD physical run length (defined as a long physical run length) greater than or equal to 7T to burn the trusted optical disc.

[0060] see image 3 , wherein the dotted line is the readout radio frequency signal of the original optical disc including only the original file, and the solid line is the readout radio frequency signal of the trusted optical disc. It can be seen from the figure that compared with the original optical disc, the readout RF signal with sub-pits and sub-banks only causes amplitude changes at the adding positions, but does not change the phase of the over-slicing level. The DVD decoding process is as follows: 1. The analog radio frequency signal is ...

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Abstract

The invention provides a trustful disc driver with data hiding and encrypting function. The driver comprises a data transmitting unit, a main controller, an embedded controller and an optical head assembly. The data transmitting unit is used to transmit an original file to the main controller and to transmit a hidden file to the embedded controller. The main controller converts the original file into first laser recording switch signals and transmits the signals to the embedded controller. The embedded controller is arranged between the main controller and the optical head assembly to convert the hidden file into second laser recording switch signals; the first laser recording signals and the second laser recording signals are coded to form third laser recording signals. The optical head assembly records on a disc according to the third laser recording signals to form pits, lands, sub-pits and sub-lands.

Description

technical field [0001] The invention relates to an optical disc drive (optical drive), in particular to a trusted optical disc drive with data hiding and encryption functions. Background technique [0002] Existing digital disc products convert information into binary data, and the binary data corresponds to two different physical states of the record symbol of the storage medium in a certain modulation method to realize data storage. This type of storage method is called binary storage. The current read-only optical disc storage technology adopts a binary storage method. According to the intensity of reflected light, it can be judged whether the current corresponding position is "Pit" or "Land". Each recording unit Two state numbers can be recorded on it, that is, information corresponding to exactly 1 bit. The user obtains the information recorded on the digital disc through the decoder. [0003] Today, with the increasing awareness of security and privacy, the confiden...

Claims

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Application Information

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IPC IPC(8): G11B20/00
CPCG11B20/00594
Inventor 裴京徐海峥杨波
Owner TSINGHUA UNIV