Encrypted Data Copying via Pre-encrypted Media Key Block

Solution Overview

Problem

Conventional methods of copying encrypted data between storage media are vulnerable to security breaches due to the need for complex encryption and decryption processes and exposure of decrypted data, especially when unique encryption algorithms or keys are used for each medium.

Innovation Solution

A method and apparatus that involve encrypting a media key block using a predetermined key of the destination storage medium and storing it along with the encrypted data, allowing for secure decryption of the data without requiring decryption and re-encryption processes, thereby maintaining security and reducing computational overhead.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If conventional encryption and decryption processes are used to copy data between storage media, then data can be transferred between different encryption systems, but security is compromised due to exposure of decrypted data and complex calculations

Engineering Contradiction:

Improvedata transfer capabilityVSAvoidsecurity level

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent applies preliminary action by pre-encrypting the media key block with the destination medium's encryption algorithm before data transfer. This allows the encrypted key block to be transferred directly without decryption, eliminating security vulnerabilities while maintaining adaptability between different encryption systems.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent extracts the encryption key management function from the data transfer process. By separately handling the media key block encryption with the destination algorithm while keeping the original data encryption intact, it enables direct transfer without full decryption, thus maintaining security while achieving compatibility.

Inventive Principle:

Principle #2Taking out (Extraction)

2Reliability

If unique encryption algorithms are used for each storage medium to prevent hacking, then security is improved, but copying time increases due to required decryption and re-encryption processes

Engineering Contradiction:

Improvesecurity levelVSAvoidcopying time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent applies preliminary action by pre-encrypting the media key block with the destination medium's encryption algorithm before data transfer. This allows the encrypted key block to be transferred directly without decryption, eliminating security vulnerabilities while maintaining adaptability between different encryption systems.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent extracts the encryption key management function from the data transfer process. By separately handling the media key block encryption with the destination algorithm while keeping the original data encryption intact, it enables direct transfer without full decryption, thus maintaining security while achieving compatibility.

Inventive Principle:

Principle #2Taking out (Extraction)

3Adaptability or versatility

If decrypted data is transferred between storage media to enable copying, then compatibility between different encryption systems is achieved, but security breaches become possible

Engineering Contradiction:

ImprovecompatibilityVSAvoidsecurity vulnerability

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The patent applies preliminary action by pre-encrypting the media key block with the destination medium's encryption algorithm before data transfer. This allows the encrypted key block to be transferred directly without decryption, eliminating security vulnerabilities while maintaining adaptability between different encryption systems.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent uses an intermediary approach by introducing a transformed media key block that is encrypted with the destination algorithm. This intermediary structure allows compatibility between different encryption systems while preventing direct exposure of decrypted data, thus eliminating security vulnerabilities.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS7987361B2Method of copying and decrypting encrypted digital data and apparatus therefor

Publication Date: 2011.07.26 SAMSUNG ELECTRONICS CO LTD

AI summary

A method of and an apparatus for copying and decrypting encrypted digital data. The method of copying encrypted digital data includes encrypting a first media key block to be used for decryption of the encrypted digital data using a predetermined key of a second information storage medium and storing the encrypted digital data and the encrypted first media key block in the second information storage medium. Security of data encryption is heightened by not discarding an encryption key used for an initial encryption, encrypting the encryption key used for initial encryption using another encryption key used for a second encryption, and storing the encrypted encryption key with the data. Also, since unnecessary decryption and encryption of data are not repeated, the time required for copying data is reduced, and since data is transferred between apparatuses in an encrypted state, a security level is higher.