Physical Medium Encryption Key Transfer
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Solution Overview
Problem
Existing digital data protection systems on physical media fail to prevent unauthorized reading and copying, as they require pre-known lists of authorized readers and can be compromised by copying, which weakens data protection.
Innovation Solution
Implementing a method that uses a symmetrical algorithm for data encryption with a key independent of the recorder, and transferring this key via an asymmetrical algorithm to the medium, allowing only authorized users to access and copy data by deriving a user key from their identifier, thereby invalidating asymmetrical ciphering means.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a list of authorized readers is stored on the medium, then authorized readers can access the data, but the system becomes complex and requires pre-known lists of authorized readers
Solution Approach 1:
The patent extracts the authorization mechanism from a pre-stored list of authorized readers and replaces it with a cryptographic key transfer system. The key is transferred individually to each authorized reader's calculation means, eliminating the need for maintaining and storing comprehensive authorization lists on the medium.
Solution Approach 2:
The patent introduces a cryptographic key as an intermediary between the author and the reader. Instead of directly storing authorization lists, the system uses key transfer mechanisms (asymmetrical algorithm) to securely convey access rights to the calculation means of authorized readers.
2Device complexity
If the same ciphering key is used for all readers, then the system is simpler, but any reader with the key can read the data including unauthorized readers
Solution Approach 1:
The patent segments the single master key into multiple individual keys, with each authorized reader receiving a unique key through the asymmetrical algorithm. This segmentation ensures that only specific readers with their respective keys can access the data, preventing unauthorized reading while maintaining manageable complexity.
Solution Approach 2:
The patent applies local quality by assigning unique cryptographic keys to specific readers based on their individual authorization status. Each authorized reader receives a key tailored to their specific access rights, creating localized security characteristics that prevent unauthorized access while allowing legitimate reading.
3Reliability
If data are ciphered with a key independent from the recorder, then the protection is stronger, but the key transfer process becomes more complex
Solution Approach 1:
The patent replaces complex mechanical or procedural key transfer mechanisms with cryptographic algorithms. The asymmetrical algorithm provides a mathematically secure and automated key transfer process, eliminating the need for complex manual key distribution systems while maintaining strong data protection.
4Adaptability or versatility
If the medium allows copying of multimedia data, then user flexibility is improved, but the protection against unauthorized copies is weakened
Solution Approach 1:
The patent introduces dynamic control over copying through the cryptographic key mechanism. The system can dynamically authorize or prohibit copying based on the reader's key and the medium's protection settings, allowing flexible user operations while maintaining strong protection against unauthorized copying through cryptographic validation.
Data Source
AI summary
A method of storage of digital data on a physical medium equipped with calculation circuitry, by ciphering the data using a symmetrical algorithm with a ciphering key independent from the recorder, and by transferring the ciphering key onto the medium or its calculation by an asymmetrical algorithm and a read method in which, on first reading from the physical medium, a user key is transferred to the calculation circuitry by an asymmetrical ciphering process, a ciphered key of the data ciphering key is calculated in the calculation circuitry of the medium and by a symmetrical algorithm with the user key, and the asymmetrical ciphering portion of the calculation circuitry are deactivated.