Dispersed Storage Encoding for Secure Failure-Tolerant Data Storage

The patent segments data into multiple slices and distributes them across different storage units. Each slice is encrypted with unique keys, so that no single storage unit holds the complete unencrypted data. This segmentation approach maintains data availability across distributed units while enhancing security through encryption and key distribution mechanisms.

The patent introduces authentication and authorization modules as intermediaries between access requests and stored data. These modules verify credentials, check permissions, and manage key distribution, acting as a security layer that protects distributed data without compromising availability. The intermediary ensures that only authorized users can access specific data slices.

The patent uses error correction codes to create redundant information in the form of parity slices rather than simple data copies. These parity slices enable reconstruction of original data even when some storage units fail, providing failure tolerance with more efficient use of storage capacity compared to traditional redundant copying methods.

The patent changes the parameter of data representation by applying encryption and error correction coding. Instead of storing raw data copies, the system transforms data into encrypted slices with embedded redundancy, allowing the same storage capacity to provide both security and failure tolerance functions simultaneously.

The patent implements preliminary authentication and authorization actions before data access. User credentials are verified and permissions are checked in advance, and appropriate encryption keys are distributed beforehand. This preliminary security processing prevents security checks from blocking data access paths during actual retrieval operations, maintaining both security and access speed.

The patent implements self-service mechanisms where authenticated users receive their own decryption keys and can independently access their authorized data without requiring real-time intervention from central authentication authorities. This self-service approach maintains security through cryptographic protection while eliminating bottlenecks that would slow down data access.