how to encrypt json data on client side using public key and decrypt on server side by using private key using RSA asymmetric encyption algorithm OR combining both symmetric and asymmetric algorith...
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To prevent irrelevant keys from being offered, you have to explicitly specify this in every host entry in the ~/.ssh/config (on the client machine) file by adding IdentitiesOnly like so:
Host www.somehost.com
IdentityFile ~/.ssh/key_for_somehost_rsa
If you have root access to the server, the easy way to solve such problems is to run sshd in debug mode, by issuing something like /usr/sbin/sshd -d -p 2222 on the server (full path to sshd executable required, which sshd can help) and then connecting from the client with ssh -p 2222 user@host