![]() It provides the best compatibility of all algorithms but requires the. A more secure alternative to this of course would be to copy your private key to the laptop which you are using, or in-fact generate a new. You are not using OpenSSH, so also read the documentation on how exactly the negotiation works in your implementation. Ssh-keygen defaults to RSA therefore there is no need to specify it with the -t option. Restart the ssh server, and when you connect from the client you should be prompted for a password if there is no private key present, or if the private key doesnt match the public key on the server. ssh -vv and examine the algorithms around the KEXINIT events. ![]() For example, OpenSSH client at higher verbosity will say exactly what the client and server has for algorithms. Get the ssh client to say what KEX was attempted. The manual page documents the options and formats supported. This should be done on the newer machine, the one that generated the key. Wireshark can do some detailed dissection of ssh protocol, to see what happens in the packets. If you dont want to do that, then you can convert the existing private key using ssh-keygen -i and ssh-keygen -e to convert your private key to the appropriate format. While troubleshooting this, start a packet capture on the server for its ssh port. Have them update their sftp software to be sure it has modern algorithms. Key exchange algorithms are updated over time as cryptography research makes older methods insecure. ![]() Compare to ensuring a TLS encrypted https session exists before sending secrets to a web server. The entire point of the ssh protocol is to establish an encrypted channel where it is possible to send such weak authentication as passwords over insecure networks. It's as simple as downloading and running Pageant and importing your key, or generating a new one using PuTTYgen. PuTTY supports using public keys, so by default so does FileZilla. This is different from user authentication, where user keys or passwords or Kerberos are among the options. 3 Answers Sorted by: 23 FileZilla uses the PuTTY suite of tools for its SSH implementation. SSH key exchange establishes a one-time session key, and authenticates the server via its host key.
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