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TKey SSH Agent 1.1.1.0, developed by Tillitis, is a security-focused SSH authentication utility that replaces the standard OpenSSH agent with a hardware-backed alternative. The application offloads the critical private key material to the Tillitis TKey, a USB security token that stores an ed25519 key pair internally and never exposes the secret to the host operating system. When a user initiates an SSH connection, the TKey performs the cryptographic signature on-board, returning only the signed challenge to the agent, thereby eliminating the risk of key theft through malware or memory scraping. This architecture makes the tool especially attractive to system administrators, DevOps engineers, and developers who manage large fleets of Linux or cloud servers and require phishing-resistant, hardware-enforced authentication. Typical use cases include automated CI/CD pipelines, secure remote shell sessions, and privilege-escalation workflows in zero-trust environments. The agent is distributed in four distinct versions—presumably covering Windows, macOS, Linux, and a portable source build—ensuring cross-platform compatibility with mainstream workstations and build servers. Because the private key never leaves the USB device, users can roam between machines without copying or trusting host-side key files, simplifying compliance audits and incident-response procedures. The software is available for free on get.nero.com, with downloads provided via trusted Windows package sources (e.g. winget), always delivering the latest version, and supporting batch installation of multiple applications.
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