cathugger

cathugger is an independent software publisher distributing open-source tools through GitHub, with a catalog currently centered on a single specialized security utility: mkp224o, a vanity address generator for Tor onion v3 (ed25519) hidden services. The product falls into the cryptography and network privacy software category, addressing a niche but practical need within the Tor ecosystem. Tor hidden services are normally identified by long, randomly generated addresses derived from ed25519 public keys, which makes them difficult to remember, communicate, or recognize. mkp224o applies brute-force key generation techniques to search for onion addresses containing user-specified prefixes or patterns, enabling operators to obtain addresses that are partially human-readable or brandable while still conforming to the v3 protocol specification. The tool is implemented as a command-line application with a focus on performance, supporting multi-threaded computation so that the computationally intensive key search can take advantage of multiple CPU cores. Typical use cases include website and service operators who want memorable onion endpoints for their hidden services, organizations seeking consistent addressing across mirrors, researchers studying Tor infrastructure, and privacy-conscious users who wish to make their services easier to verify and share. The software fits into broader deployment workflows for anonymous hosting, secure communications, and censorship-resistant publishing, and it is commonly used alongside Tor daemon configurations on Linux and Unix-like systems. As a command-line utility distributed as source code, it targets technically proficient users such as system administrators, developers, and security practitioners rather than general consumers.