How do I choose a strong password?

General Guidelines:

So, how do you have a “strong” password that is easy to remember? While it may seem tough to do this, there are a few simple tips that can make it easy.Note: the examples below illustrate just the concepts being discussed.  No single technique should be used on its own, but rather should be used with other techniques. The combination of several will produce a strong password.

  • Use a mix of alphabetical and numeric characters.
  • Use a mixture of upper- and lowercase; passwords are case sensitive.
  • Use symbols if the system allows (spaces shouldn’t be used as some applications may trim them away)
  • Use a combination of letters and numbers, or a phrase like “many colors” using only the consonants, e.g., mnYc0l0rz or a misspelled phrase, e.g., 2HotPeetzas or ItzAGurl .
  • Pick something obscure:
    • an odd character in an otherwise familiar term, such as phnybon instead of funnybone;
    • a combination of two unrelated words like cementhat
    • An acronym for an easy to remember quote or phrase (see below)
    • a deliberately misspelled term, e.g., Wdn-G8 (Wooden Gate) or HersL00kn@U (Here’s looking at you).
    • Replace a letter with another letter, symbol or combination, but don’t be too obvious about it.  Replacing o with 0 or a with 2 or i with 1 is something that hackers just expect.  It is definitely better than nothing, but replacing 0 with () would be stronger as it makes your password longer and is not as obvious
    • An easily phonetically pronounceable nonsense word, e.g., RooB-Red or good-eits .
    • Two words separated by a non-alphabetic, non-numeric, or punctuation character, e.g., PC%Kat or dog,~1#


You want to choose something that is easy to remember with a minimum of 8 characters that uses as many of the techniques above as possible. One way to do this is to pick a phrase you will remember, pick all the first or last letters from each word and then substitute some letters with numbers and symbols. You can then apply capitals to some letters (perhaps the first and last, or second to last, etc.) You could also perhaps keep or add punctuation.

Some examples:


First Letters


So long and thanks for all the fish”



“Best Series Ever: Terry Goodkind’s Sword of Truth”



“You Can’t Have Everything. Where Would You Put It?”



If you are selecting a password for a website, you may want to incorporate the first few letters of the website name into your password so that every password is different and if one gets out, you don’t have to change them all. This approach has good and bad points.

For example, if you have a standard password like B53:tg’Sot (see above) that you like to use most places (this not recommended), you may modify it by placing the first and last letter of the website around it:






Do Not Choose…

  • Your name in any form — first, middle, last, maiden, spelled backwards, nickname or initials.
  • Any ID number or user ID in any form, even spelled backwards.
  • Part of your userid or name.
  • Any common name, e.g., Sue, Joe.
  • Passwords of fewer than six characters.
  • The name of a close relative, friend, or pet.
  • Your phone or office number, address, birthday, or anniversary.
  • Acronyms, geographical or product names, and technical terms.
  • Any all-numeral passwords, e.g., your license-plate number, social-security number.
  • Names from popular culture, e.g., Harry_Potter, Sleepy.
  • A single word either preceded or followed by a digit, a punctuation mark, up arrow, or space.
  • Words or phrases with all the vowels or white spaces deleted.
  • Words or phrases that do not mix upper and lower case, or do not mix letters or numbers, or do not mix letters and punctuation.
  • Any word that exactly matches a word in a dictionary, forward, reversed, or pluralized, with some or all of the letters capitalized, or with any of the following substitutions:
  • a -> 2, a -> 4, e -> 3, h -> 4, i -> 1, l -> 1, o -> 0, s -> $, s -> 5, z -> 5


If you only use words from a dictionary or a purely numeric password, a hacker only has to try a limited list of possibilities. A hacking program can try the full set in under one minute. If you use the full set of characters and the techniques above, you force a hacker to continue trying every possible combination to find yours. If we assume that the password is 8 characters long, this table shows how many times a hacker may have to before guessing your password. Most password crackers have rules that can try millions of word variants per second, so the more algorithmically complex your password, the better.


Character Sets used in Password


Possible Combinations

Dictionary words (in english):
(It is debatable but lets generously say ~600,000 words)


Numbers Only



Lowercase Alpha Set only



Full Alpha Set



Full Alpha + Number Set



Full Set of allowed printable characters set



The longer your password the more secure. If we take the full set of allowed printable characters set (the last line above) and increase the password length, the possible combinations jump exponentially (odd, considering that the calculation includes exponents…)

  • 8 Characters > 645,753,531,245,761 (645 Trillion) Combinations
  • 9 Characters > 45,848,500,718,449,031 (45 Quadrillion) Combinations
  • 10 Characters > 3,255,243,551,009,881,201 (3 Quintillion) Combinations

When we refer to character sets, they are typically numbers, upper and lowercase letters and a given set of symbols. For example:


Number of Characters









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