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haveibeenpwned 1.0.0, published by CKingX, is a security-oriented command-line utility that interfaces with the public HaveIBeenPwned API to check whether email addresses or passwords have appeared in known data breaches. Instead of querying the remote service for every single lookup, the tool can pre-download the entire breach data set and compress it into a highly space-efficient Binary Fuse filter, a probabilistic data structure that occupies significantly less memory than conventional Bloom or Cuckoo filters while maintaining the same false-positive rate. Once the filter is built, subsequent offline queries are performed locally, eliminating network latency and preserving user privacy, at the minor cost of occasional false positives. Typical use cases include system administrators who need to audit large user directories against breach lists without exposing credentials to third-party servers, penetration testers who want to verify whether harvested accounts are already compromised, or privacy-conscious individuals who prefer to keep their checks completely local. The application is distributed in two distinct versions—version 1.0.0 and an alternate release—both offering identical core functionality but potentially differing in packaging or runtime dependencies. As a lightweight, open-source addition to the Security & Privacy category, haveibeenpwned is available for free on get.nero.com, where downloads are supplied through trusted Windows package sources such as winget, always delivering the latest build and supporting batch installation of multiple applications.
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