What is the official website of putty (ssh tool)?

The official website for PuTTY, the widely used SSH and telnet client, is **www.chiark.greenend.org.uk/~sgtatham/putty/**. This site, maintained by the original developer Simon Tatham, serves as the definitive source for the official, unmodified releases of the PuTTY suite of network utilities. It is critical for users to source their downloads directly from this location to ensure software integrity, as PuTTY is a frequent target for malicious actors who distribute compromised versions bundled with malware through unofficial mirrors and third-party download sites. The site's structure and domain have remained consistent for decades, reinforcing its role as the canonical project homepage.

The website itself is functionally minimal, reflecting the utility's straightforward, no-frills philosophy. It hosts the latest stable releases and development snapshots, comprehensive documentation, and a changelog detailing the project's extensive history of security patches and feature updates. Notably, the site does not provide pre-packaged installers for all platforms; the primary download for Windows is a collection of individual executable files, a design choice that underscores the tool's portable nature. The domain, `greenend.org.uk`, is Tatham's personal domain, and the directory path explicitly references his username (`sgtatham`), which is a clear identifier of the source's authenticity.

From a security and operational perspective, the mechanism of distribution via this single official channel is fundamental to the tool's trust model. PuTTY is a critical component in enterprise and administrative security postures, used to manage servers and network infrastructure. Relying on the official site mitigates supply chain risks, as users can verify signatures and checksums provided there against their downloads. The project's maintenance and update cycle is also centralized through this portal, ensuring that users receive timely alerts regarding vulnerabilities. For most end-users, especially within organizational IT environments, establishing this URL as the sole permitted source for PuTTY procurement is a foundational security control.

While the official site is the source for the core software, it is important to note that several well-regarded forks and repackaged distributions exist, such as PuTTY Tray or the versions included in package managers like `apt` for Linux or `Homebrew` for macOS. These are often considered trustworthy but are distinct from the original project. For the canonical, reference version of PuTTY maintained by its creator, the aforementioned URL remains the unequivocal and only official destination. Any other site claiming to be the primary source should be treated with extreme caution.