Assuming an attacker can't know your information is not a good idea.
Your login information can be gained via keyloggers, network sniffing, phishing scams, malware, malicious employees, and all sorts of other methods..
This is why two-factor authentication is so important, to help prevent your account from being compromised in the event that your username and password is.
Your login information can be gained via keyloggers, network sniffing, phishing scams, malware, malicious employees, and all sorts of other methods..
This is why two-factor authentication is so important, to help prevent your account from being compromised in the event that your username and password is.