Architecture

System overview

General overview of the system architecture and functionalities.

Protocols

This describes the protocol for the Bit Repository.

• Message exchange protocol —  
  • Message flow — Describes the general messageflow in communication between the Bit Repository components.
  • Protocol messages — Description of the different protocol messages, which operation it applies to, and their types.
  • Message format — Description of the the XML basic message structure and format.
• File Exchange protocol — Describes the underlying protocol used as the File Exchange.
• Protocol versioning — Describes how a system of components supporting different versions of the protocol should work.
• Operations descriptions — Documentation of the different operation primitives that the protocol describes
  • DeleteFile — Operation to remove a file from one or more pillars in a collection
  • GetAuditTrails — Operation to retrieve audittrails for a specific collection from one or more contributors
  • GetChecksums — Operation to get checksums from one or more pillars in a given collection.
  • GetFile — Operation to retrieve a single file from a collection.
  • GetFileIDs — Operation to get fileIDs from one or more pillars in a given collection.
  • GetFileInfos
  • GetStatus — Operation to retrieve status from components in a repository
  • PutFile — Operation to ingest a file on one or more pillars in a collection.
  • ReplaceFile — Operation to replace a file on one or more pillars in a collection.

Security

Description of the security model of the Bit Repository

• Encryption — To prevent anybody from eavesdropping on the bit repository data and messages exchanged, all communication is encrypted. 
• Authentication — To ensure messages are transmitted, untampered signature based authentication is used.
• Authorisation — Describes how messages requesting operation on a collection are checked against the permission model.