According to the ConnectBot issue tracker, it’s not possible to retrieve the private key that it created. You’ll have to make a new key pair, and share the new public key with tildes. The keys are randomly-generated, so the new pair will be different, regardless of whether you use the same password.

You should do one private key per host. If you want access to something with a key from you phone and computer you should have one key on each. To use ssh from somewhere, from that place to your computer, gitlab, whatever, it needs the private key in the correct place. If it is a shell (like termux) it should be e.g. yoir home folder then .ssh/id_rsa. If its an app, I guess ot tells you(, but I would not give my private key to a random app). To be able to get to somewhere, like from your phone to your computer, your computer needs the public key. The cannonical place to put it is as a single line in a file ‘authorized_keys’ in the .ssh folder in your home folder.

I’m not sure where ConnectBot stores its keys, so I can’t help with the ‘transferring to termux’ part :-)

What I can tell you is that you should be able to generate and use SSH keys directly in Termux. Here’s a quick guide on how to do it: https://gist.github.com/evandrocoan/f503188587587d7b1d1ba8746c9c6107

I’ve switched phones recently, and I haven’t set up my keys yet, but as far as I recall I went through a similar process a few years ago to set up SSH keys on my phone (I haven’t tried the steps in that article myself).

If you sent a public key for connection, only the private key associated with it will be able to connect. If you regenerate new keys, it doesn’t matter what passphrase you use, it will be different keys. Keys are randomly generated and your passphrase does not impact this, it “only” encrypts your private key at rest so that if someone steals it, it cannot be used without the passphrase.

It is generally advised to create different key pairs for each device and each server to connect to, in this since both termux and connectbot are an your phone you may want to use the same key, or you may generate a new key pair in termux and share the public key again to be authorized to connect with this new private key.

If you want to reuse your old key, you have to find where it currently is and copy it to ~/.ssh/. I would advise to inform ssh how to connect to your server by editing (or creating) the ~/.ssh/config file (you can find the syntax online). It should mention the key to use to connect to your host.

I don’t know connectbot, but it’s probably not putting the keys where openssh is expecting them.

By default, ssh looks for keys in ~/.ssh/id_rsa(.pub for the public key).

What I would do is just run ssh-keygen from termux, let it create the .ssh folder and set the correct permissions etc., see where it put that folder, and then just replace the id_rsa files with those from connectbot.

I thought title just said sh and not ssh i got really scared

ConnectBot is screwed, just use termux, so much easier and stable