General rules for a strong passhprase are to increase the length to at least 12 characters using a mix of upper and lower case alphabet characters, numbers, and symbols, that have no relationship with you or your personal information. Avoid common dictionary words. You can use words from the Diceware™ wordlist or the EFF word list. Luckily, you don’t have to memorize arcane strings of random letters, numbers and symbols to take advantage of all of these policies and practices into your passwords.
How secure your password is depends on three simple factors. The most important factor is the length of your password. The second most important factor to make sure your password is strong is that the password must not consist of patterns. Patterns that someone could figure out based on things they may already know about you or that they can discover about you. In order to make your password secure you need to make passwords that contain as many characters as allowed by the web site or app for which you are creating the password. The third most important factor in securing your password is how often you reuse your password. Once is more than enough.
Ideally a password should only be used once. The more often you reuse a password, the more likely that password will become exposed in a data breach. Once that password has been exposed, the hackers can try that same password on other common websites. If you have used it more than once there is a good chance that one site being hacked could cause all of your social media accounts, or banking logins to be compromised.
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