System for generating a security document

A method of generating a security document on a computing process, the process running on a computing node comprising one or more hardware processors, the computing node forming part of a computing cluster, each computing cluster including multiple computing nodes and each node having a node identifier for uniquely identifying the node within the cluster, each node being capable of running multiple concurrent processes, each process being executed by least one of the one or more hardware processors and each process having a process identifier for uniquely identifying the process within the node, and the method comprising:

• a. collecting information for inclusion in the document, the information including at least a subject identifier for uniquely identifying a subject of the document;
• b. generating a first random value and a second random value;
• c. concatenating the subject identifier and the second random value;
• d. applying a cryptographic hash function to the concatenation of the subject identifier and the second random value;
• resulting in a message digest value;
• e. truncating the message digest value;
• f. generating a document identifier, by at least one of the one or more hardware processors, comprising a concatenation of the node identifier, a first delimiter, the process identifier, the first random value, a second delimiter, and the truncated message digest value;
• g. generating the security document by formatting the information into a human-readable document in the form of a digital file, and applying the document identifier visibly to the document;
• and
• h. storing the document and the document identifier in a database, the document being retrievable from the database by means of the document identifier.