Distributed Data Encryption With Slice-Based IV Renewal
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Solution Overview
Problem
Peer-to-peer file sharing systems lack effective security mechanisms for distributing media content, leading to piracy and uncontrolled distribution environments, which deter content providers from adopting them for secure content distribution.
Innovation Solution
Implement a two-layer content protection system using slice-specific and segment-specific initialization vectors (IVs) in addition to the Content Encryption Key (CEK), with a Trusted Execution Environment (TEE) for secure key management and periodic renewal of initialization vectors to obsolete compromised content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If peer-to-peer file sharing is used for content distribution, then distribution speed and efficiency are improved, but security and control over content are worsened
Solution Approach 1:
The content is divided into multiple slices that are distributed across the peer-to-peer network. Each slice is encrypted with a unique initialization vector, so that compromising one slice does not endanger the entire content. This segmentation allows fast distribution while maintaining security through distributed encryption keys.
Solution Approach 2:
The system implements periodic renewal of initialization vectors for content slices. By regularly updating the encryption parameters and rotating keys, the system maintains security over time in the distributed environment, preventing long-term exposure risks while preserving distribution efficiency.
2Device complexity
If content is encrypted with a single Content Encryption Key, then encryption simplicity is improved, but security against key compromise is worsened
Solution Approach 1:
Instead of using a single encryption key for all content, the system segments the content into slices and applies unique initialization vectors to each slice. This maintains relatively simple encryption operations while significantly improving security, as compromise of one slice's key does not expose other slices.
Solution Approach 2:
Each content slice is encrypted with locally unique parameters (slice-specific initialization vectors) rather than a uniform global key. This local differentiation of encryption parameters enhances security against key compromise while keeping the overall encryption scheme manageable and not excessively complex.
3Reliability
If initialization vectors are renewed periodically, then security over time is improved, but system complexity and operational overhead are worsened
Solution Approach 1:
The system implements structured periodic renewal of initialization vectors at defined intervals. This regular, predictable pattern manages security over time while avoiding ad-hoc complexity, as the renewal schedule and procedures can be pre-configured and automated.
Solution Approach 2:
The initialization vector renewal process is designed to be largely automated and self-managing within the system. Trusted entities can renew vectors without requiring complex manual intervention, reducing operational overhead while maintaining security over time through systematic key rotation.
Data Source
AI summary
Systems and methods are described for encrypting and decrypting data in a distributed storage environment. Such systems and methods for encryption may divide a data payload into slices, the slices including a first slice and a subsequent slice, employ a content encryption key and an initialization vector, encrypt the first slice using the content encryption key and the initialization vector, generate a subsequent initialization vector for the subsequent slice based upon the initialization vector and the unencrypted content of the first slice, and encrypt the subsequent slice using the subsequent initialization vector and the content encryption key. The systems and methods may then generate a list of the encrypted slices into which the data payload has been generated, and publish to a secure storage location, the slice list, the content encryption key and the initialization vector for the first slice in the slice list, with the slices outputted to the distributed storage environment. Systems and methods for decryption may receive, from a secure storage location, a slice list, a content encryption key, and an initialization vector, determine the encrypted slices to be received from the distributed storage environment. The systems and methods may receive, from the distributed storage environment, at least encrypted first slice and the encrypted subsequent slice, and decrypt the first slice using the content encryption key and the initialization vector, to generate a decrypted first slice, and generate a subsequent initialization vector for the subsequent slice based upon the initialization vector and the decrypted first slice, decrypt the subsequent slice using the subsequent initialization vector and the content encryption key, and combine the first slice and the subsequent slice into a data payload.