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PuTTY CAC 0.83.0.1 is a security-hardened terminal emulator that extends the classic PuTTY codebase maintained by Simon Tatham with native support for smart-card and certificate-based authentication, making it a specialized Remote Connectivity tool for Windows environments where cryptographic tokens replace traditional passwords. Originally spun out of U.S. Department of Defense requirements, the program preserves PuTTY’s familiar SSH, Telnet, serial and raw socket connectivity while adding Microsoft CAPI and PKCS #11 middleware hooks, so users can log on to routers, switches, Unix servers, cloud instances or secure jump hosts simply by inserting a Common Access Card, PIV, CAC or compatible USB token. Network administrators, defense contractors, healthcare institutions and financial firms rely on the client to satisfy multi-factor mandates without distributing static keys, and ten successive releases since the fork have refined token detection, PIN caching, X.509 chain validation and algorithms such as ECDSA-P384 and RSA-4096. Session persistence, proxy forwarding, IPv6, port tunneling and SCP-compatible file transfers remain intact, ensuring legacy scripts continue to run while new policies enforce hardware-backed identity. The lightweight executable runs on every supported Windows edition, stores portable settings alongside the binary for USB deployment, and can be scripted through command-line options for automated batch logins. PuTTY CAC 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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