Information Carrier Access Information Scrambling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing information carriers face challenges in preventing illegal retrieval of user information, as access information can be detected and copied using integration detection techniques, especially in spread spectrum methods where the bandwidth is intentionally expanded.
Innovation Solution
Scrambling access information bits using a pre-determined method, storing them in a variation of a parameter detectable by integration detection, and hiding the scrambling method within the radial excursion of a wobbled pre-groove, making it impossible to detect without knowing the processing required, and allowing for easy method changes if hacked.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If access information is stored using spread spectrum techniques in a variation of a parameter detectable by integration detection, then the access information can be detected by integration detection, but the access information becomes vulnerable to illegal retrieval and copying
Solution Approach 1:
The patent applies parameter changes by scrambling the access information bits according to a pre-determined scrambling method before storage. This transforms the original detectable parameter (integration detection signal) into a scrambled form that maintains detectability for authorized users with the scrambling key, while preventing unauthorized detection and copying. The scrambling changes the statistical and temporal parameters of the signal without altering its fundamental detectability property.
2Ease of operation
If the access information is made detectable through integration detection, then it can be read out, but it becomes possible for hackers to detect and copy the access information
Solution Approach 1:
The patent implements preliminary action by pre-scrambling the access information bits using a predetermined scrambling method before they are stored on the information carrier. This preliminary scrambling action ensures that when the information is later read out through integration detection, only authorized devices possessing the corresponding scrambling key can properly detect and decode the access information, while hackers without the key cannot retrieve it even if they detect the signal.
3Ease of operation
If the access information is stored in a detectable form, then it can be accessed by users, but the copy protection mechanism becomes weaker
Solution Approach 1:
The patent introduces an intermediary element - the scrambling key - that mediates between the stored access information and the reading device. The access information is stored in a detectable form through integration detection, but the scrambling key acts as an intermediary that authorized devices must possess to properly decode and access the information. This intermediary mechanism maintains user accessibility while significantly strengthening copy protection, as hackers lacking the intermediary key cannot retrieve the access information even if they detect the signal.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Prevents illegal retrieval of user information by ensuring that access information can only be obtained by knowing the scrambling method, making it difficult for hackers to integrate the signal, and allows for secure and adaptable copy protection.
Implementation Method 1
the access information bits being stored on the information carrier in a variation of a parameter, which variation is detectable by integration detection
Data Source
AI summary
An information carrier for holding user information, the information carrier comprising access information in the form of access information bits for accessing the user information, the access information bits being stored on the information carrier in a variation of a parameter, which variation is detectable by integration detection. The access information bits are scrambled according to a pre-determined scrambling method. By scrambling the access information bits according to a pre-determined scrambling method, detection of the access information is not possible as long as the scrambling method is not known. Using the integration detection technique, the only way to obtain the access information is by knowing how the signal obtained after reading-out the area comprising the access information bits must be processed. In this way illegal retrieval of the user information is further prevented.