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An audit trail (also called audit log) is a security-relevant chronological record, set of records, and/or destination and source of records that provide documentary evidence of the sequence of activities that have affected at any time a specific operation, procedure, or event. Audit records typically result from activities such as financial transactions, scientific research and health care data transactions, or communications by individual people, systems, accounts, or other entities.
The process that creates an audit trail is typically required to always run in a privileged mode, so it can access and supervise all actions from all users; a normal user should not be allowed to stop/change it. Furthermore, for the same reason, trail file or database table with a trail should not be accessible to normal users. Another way of handling this issue is through the use of a role-based security model in the software. The software can operate with the closed-looped controls, or as a 'closed system', as required by many companies when using audit trail functionality.
In telecommunication, the term means a record of both completed and attempted accesses and service, or data forming a logical path linking a sequence of events, used to trace the transactions that have affected the contents of a record.
In information or communications security, information audit means a chronological record of system activities to enable the reconstruction and examination of the sequence of events and/or changes in an event.
In nursing research, it refers to the act of maintaining a running log or journal of decisions relating to a research project, thus making clear the steps taken and changes made to the original protocol.
- "National Information Assurance (IA) Glossary" (PDF). Committee on National Security Systems. 7 August 1996. p. 4. Retrieved 7 March 2012.
- "ATIS Telecom Glossary 2012 - audit trail". Alliance for Telecommunications Industry Solutions (ATIS) Committee PRQC. 2012. Archived from the original on 13 March 2013. Retrieved 7 March 2012.
- "SEC Proposes Consolidated Audit Trail System to Better Track Market Trades". U.S. Securities and Exchange Commission. 26 May 2010. Retrieved 7 March 2012.
- "Electronic Code of Federal Regulations - Title 21: Food and Drugs - Part 11: Electronic Records; Electronic Signatures". U.S. Government Printing Office. Archived from the original on 8 June 2010. Retrieved 2 March 2012.
- Brancik, Kenneth C. (2007). "Chapter 2: Related Research in Insider Computer Fraud and Information Security Controls". Insider computer fraud: an in-depth framework for detecting and defending against insider IT attacks. CRC Press. pp. 18–19. ISBN 1-4200-4659-4.