AV Data Processing Unit with Nested Encryption for Secure Storage

Solution Overview

Problem

Decrypted digital audio/video data is vulnerable to unauthorized access and reproduction, posing a risk of abusive exploitation and copyright violations, as it can be diverted and processed by external systems without supplier control.

Innovation Solution

A processing unit with a deciphering and encryption unit, utilizing personal and common encryption keys for secure transmission and re-encryption of data, along with a security module for verification and integrity check of random numbers, ensures that data can only be decrypted with authorized access, preventing unauthorized use and reproduction.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If decrypted data is stored in a separate memory for processing and distribution, then data processing efficiency is improved, but security against unauthorized access and reproduction deteriorates

Engineering Contradiction:

Improvedata processing efficiencyVSAvoidsecurity against unauthorized access

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent implements nested encryption by encrypting decrypted data with a second encryption key before storage. The data undergoes multiple layers of encryption: first with a decryption key during decryption, then with an encryption key before being stored in the separate memory. This nested approach allows the data to be efficiently processed and stored while maintaining multiple layers of security protection against unauthorized access and reproduction.

Inventive Principle:

Principle #7Nested doll (Nesting)

2Adaptability or versatility

If decrypted data is made accessible for distribution and processing, then data usability is improved, but vulnerability to fraud attempts and unauthorized reproduction increases

Engineering Contradiction:

Improvedata usabilityVSAvoidvulnerability to fraud attempts

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The patent applies preliminary encryption action by encrypting the decrypted data with an encryption key before it is stored in the separate memory. This preliminary security measure ensures that even if the stored data is accessed unauthorizedly, it remains protected. The encryption is performed in advance, allowing the data to be readily available for authorized distribution and processing while preemptively preventing fraud attempts and unauthorized reproduction.

Inventive Principle:

Principle #10Preliminary action

3Duration of action of stationary object

If data is stored for future use in external memories, then data availability is improved, but risk of unauthorized recovery and reproduction increases

Engineering Contradiction:

Improvedata availability for future useVSAvoidunauthorized recovery and reproduction

Core Design Contradiction:

Duration of action of stationary objectVSObject-generated harmful factors

Solution Approach 1:

The patent implements nested encryption by encrypting decrypted data with a second encryption key before storage. The data undergoes multiple layers of encryption: first with a decryption key during decryption, then with an encryption key before being stored in the separate memory. This nested approach allows the data to be efficiently processed and stored while maintaining multiple layers of security protection against unauthorized access and reproduction.

Inventive Principle:

Principle #7Nested doll (Nesting)

Solution Approach 2:

The patent applies preliminary encryption action by encrypting the decrypted data with an encryption key before it is stored in the separate memory. This preliminary security measure ensures that even if the stored data is accessed unauthorizedly, it remains protected. The encryption is performed in advance, allowing the data to be readily available for authorized distribution and processing while preemptively preventing fraud attempts and unauthorized reproduction.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS7697686B2Unit for managing audio/video data and access control method for said data

Publication Date: 2010.04.13 NAGRAVISION SA

AI summary

Example embodiments are directed to a digital audio/video (AV) data processing unit and a method of controlling access to the digital AV data. The processing unit of AV digital data includes a deciphering unit of the AV data, a decompression unit, an input/output interface of the processed AV data and communication device towards a security module. The deciphering and decompression units respectively include an encryption unit and a decryption unit, each having at least one personal key and a common encryption key. Deciphering the AV data using the control words and re-encrypting the deciphered AV data occurs only after a successful verification of the control word and the common key. After temporary storage, the re-encrypted AV data cannot be decrypted by the decryption unit unless the common key has been positively verified by the security module by way of a random number generated by the decryption unit.