Core Shell does not authenticate via public key but plain "ssh" does?

[yang (Yang.Y)]

@JJJ

Why, if I assume Core Shell is using the system's SSH binary?

No, Core Shell does not use system ssh binary, it uses OpenSSH XPC component via Apple’s XPC technology.

OpenSSH 8.8 disables RSA signatures using the SHA-1 hash algorithm by default, please find the solution in this topic:

Troubleshooting

Version 3.6 and later The embedded OpenSSH in Core Shell/ Tunnel version 3.6.x was updated to version 8.8, you might be unable to connect servers with older SSH implementations. OpenSSH 8.8 disables RSA signatures using the SHA-1 hash algorithm by default. Though there is a stopgap measure, we recommend you upgrade your SSH server or reconfigured with another key type (such as ECDSA or Ed25519). To fix connection problems, first check your connection log. Error: no matching host key type …

Kindly Regards,

Yang