Making a Strong (Highly Secure) Password

See the overview of password managers.

Passphrase = a long password of multiple words ideally with mixed case, spaces, punctuation. Passphrase is a preferable term over password because it implies greater length and complexity.

For financial and other sensitive accounts, MPG strongly advises using a complex and reasonably long but memorable passphrase.

Similarly, for a master password for unlocking a password vault with a password manager, you’ll need to imagine up and memorize something, since it must be typed in. But never skimp on a master passphrase, since it unlocks the vault containing all other passwords! See Your Master Password is your defense from Dropbox breaches, real and imagined.

For passwords stored and entered by a password manager, a passphrase can be a string of gibberish generated by a program like 1Password (see screen shot further below).

Generating a very strong gibberish password

Being able to memorize and type in a password is ideal, but with a password manager like 1Password, a long gibberish password can be generated and used, since there is no need to type it in.

Use at least 16 characters, but if a site allows it, one might as well use 24 or more characters—it cannot hurt to use more so long as the web site allows it.

1Password: creating a strong password