In digital forensics, what maintains hash signatures for known software to help identify components in a system?

• A. International Software Reference Database
• B. National Software Reference Library
• C. IEEE Hash Registry
• D. Hash Analysis Network

Answer: (B)

The main idea is using a centralized catalog of hash values for known-good software to quickly recognize components on a system. The National Software Reference Library is the repository that stores these hash signatures (such as MD5, SHA-1, and newer hashes) for widely used software and files. By comparing a system’s files against the NSRL, investigators can identify known software and distinguish it from unknown or potentially malicious files, which helps focus analysis on the items that matter. This repository, maintained by NIST, is specifically designed for this purpose and is widely used in digital forensics to triage and classify software components.