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Settings that filter Pageant certificate selection dialogs will also affect filter certificate selection dialogs in the standard PuTTY application: Once set, these options will apply automatically to subsequent executions unless specifically unset. Most of these options are focused on the operation of Pageant and are also settable from its user interface. PuTTY executables (putty.exe, pageant.exe, psftp.exe) support the following additional command line options.

Connect to using FIDO key identified by 'ssh:MyFidoKey' from PuTTY CAC FIDO key cache:.

Connect to using the certificate with thumbprint 'B8B58D8F2C3A7F98F3F645161B1BF9818B689716' using PKCS library 'PKCS.dll':.

Connect to using the certificate with thumbprint '716B8B58D8F2C3A7F98F3F645161B1BF9818B689' the user certificate store:.

In place of a PuTTY key file path for any PuTTY utility, you can specific certificate thumbprint or application identifier. PuTTY CAC supports the same command line options as PuTTY with some additional, specialized options for PuTTY CAC specifically. You can find a basic set of instructions on the usage of United States Government's ID Management website under the 'SSH Using PuTTY-CAC' section:

For FIDO support, a FIDO key supported by Windows 10.

This is typically provided by the smart card manufacturer although many common hardware tokens are supported by OpenSC.

For PKCS support, a PKCS #11 library (typically a DLL file) is needed to interface with the hardware token.

For CAPI support, an appropriate Windows smart card mini-driver must be installed.

The license can be found here: Prerequisites

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PuTTY CAC source code and binaries are free to use for any purpose. You can download the latest release of PuTTY CAC here: PuTTY CAC is maintained independently from the US Government by the open source community.

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The 'CAC' in 'PuTTY CAC' refers to Common Access Card, a smart card token used for US Government facilities which was one of the initial drivers for the development of PuTTY CAC. PuTTY CAC can be used with many types of cryptographic tokens such as Yubikeys and popular smart card models. PuTTY CAC adds the ability to use the Windows Certificate API (CAPI), Public Key Cryptography Standards (PKCS) libraries, or Fast Identity Online (FIDO) keys to perform SSH public key authentication using a private key associated with a certificate that is stored on a hardware token. PuTTY CAC is a fork of PuTTY, a popular Secure Shell (SSH) terminal.