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As per WinSCP documentation, WinScp uses the PuTTy key format, and requires that keys generated by OpenSSH be either converted or we use a /keygen command line switch.

I wanted to use SSH certificates to authenticate the server, to solve scalability issues, but this SSH certificate is generated by OpenSSH ssh-keygen, and I am not sure if certificates generated by this will work fine without issues with WinSCP or WinSCP .NET libraries.

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OpenSSH certificates is a proprietary non-standard technology.

It was added only recently in PuTTY 0.78 (October 2022).

In WinSCP, it will be available in the upcoming major version.


A related question:
Creating SSH Certificates for SFTP using a CA

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  • Alright I see. Guess SSH certs are out of the picture for the moment, since I want to continue using WinSCP. May 20, 2020 at 7:17
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a couple of weeks ago a new version of PuTTY was released which supports OpenSSH certificates: https://www.chiark.greenend.org.uk/~sgtatham/putty/changes.html WinSCP will hopefully also supporting OpenSSH certificates, but it's not yet the case https://winscp.net/tracker/1873 http://winscp.net/forum/viewtopic.php?t=32793

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