The present invention relates to a document security management system for securely managing documents or data files for users, the document management system comprising a document repository providing a facility for storing data files representing the documents, a key repository for storing a public key of one or ...

A data processing system for distributing and authenticating documents from a plurality of parties to a recipient data processing apparatus. The system comprises a plurality of document distribution devices each being operable to generate an original hash value from the content of a file containing a document to be ...