PuTTY CAC is a secure shell client designed for Windows that enhances the traditional PuTTY experience by integrating support for smart cards and certificates. This free utility allows users to securely connect to remote servers while utilizing multi-factor authentication (MFA) methods, such as smart cards and RSA or ECDSA certificates. The software is particularly useful for users needing to comply with Department of Defense (DoD) security standards, making it an ideal tool for professionals who prioritize security in their remote connections.

In addition to its core SSH functionalities, PuTTY CAC supports various authentication methods including PKCS#11 and CAPI, enabling seamless integration with existing smart card systems. The interface remains user-friendly, adhering to the familiar layout of the original PuTTY while enhancing its security capabilities. Overall, PuTTY CAC is a robust tool for anyone looking to improve their secure shell connections with advanced authentication options.