Using any device like a phone, a tablet, or a computer running windows or macos is a risky thing to do.
ANY online site is even worse.
They all have major security issues about your information and what you type into them.
An offline computer, running ubuntu, would be one way to securely generate a wallet:
Ensure the wallet is created with a pass phrase, dump the keys (and be sure you have the private keys all written down/printed correctly) then wipe the computer HDD.
(don't use an SSD, since most people don't understand how to properly wipe an SSD)
Hello there. Could you please go into more depth on what I need to do with Ubuntu? Some steps would be most helpful...thanks.
Regards
Not the person you replied to, but in a nutshell:
- Install Ubuntu in something that will never go online (Old PC, small partition, a persistent flash drive, etc.)
- Download the Appimage from electrum.org, put it on a flash drive
- Transfer the Appimage to your offline Ubuntu, run it, then create a wallet -- it's now effectively a cold wallet
- To find out how you can use your cold wallet, refer to Electrum's documentation
If you are able to make sure that your Electrum copy is clean, your Ubuntu device will never go online, and that your seeds are secure, you'd basically have an impenetrable wallet.