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Raspbian comes with a default pi user who has a password raspberry; once you change that password your RPi gets some basic security. … Having a default root password would require you to change passwords for both users in order to secure your RPi. You can set root password by running sudo passwd. …

For console logins it is possible to write a custom login script which reads the password from the keypad, and configure getty to use that script instead of the original login, or replace getty with a … custom script which runs an actual getty only after getting a password from the keypad. …

Note that if you want to keep your WiFi password encrypted (perhaps with a shorter password), the piece of software you're looking for is a password manager. … Typically a password manager can copy a password to the clipboard (if you're using X), or pipe it to a standard output, so you can use it as a part of the command line or script: command -p `pass WIFI …

This is exactly how a RW filesystem on a read-only medium looks like. There's no immediate error when you save the file, but the file is not saved after all. Try the raw IO script and see if the data …

Answer specifically concerning the "empty password" part: passwd -d will not set the password to an empty string, it will delete the password altogether, making it impossible for the user to log in using … a password. …

Put the data you're trying to protect on a separate partition and encrypt it. Typical users will want to encrypt /home. You could also encrypt the root partition itself, though that will be more diffi …

Also, hiding a password inside a C file is a polichinelle's secret: simply running strings a.out will reveal your password in cleartext. …

You don't have to create a temporary user on a different system to generate a password hash. … If you want to use a different hash function (CRYPT is very old and insecure by now), passing -1 as an extra argument will generate an MD5 password (also insecure), -5 a SHA256 and -6 SHA512. …