You don't have to make keys difficult to type. Just generate an rsa blob of whatever data you want and then pass it through a binary-to-text converter designed

You don't have to make keys difficult to type. Just generate an rsa blob of whatever data you want and then pass it through a binary-to-text converter designed to avoid confusing characters, like https://github.com/kstenerud/safe-encoding/blob/master/safe32-specification.md https://github.com/kstenerud/safe-encoding/blob/master/safe3... Then you don't leak information because it's all layered, encoded BEFORE you generate the human inputtable text, and can contain any information you want.