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POPhonetically Memorable Password Generation Algorithms
 

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    <h3>Background</h3> <p>While at the Gym the other day, I was working with my combination lock, and realized something that would be useful to me as a programmer. To wit, my combination is three seperate sets of numbers that either sound alike, or have some other relation that makes them easy to remember. For instance, 5-15-25, 7-17-2, 6-24-5. These examples <em>seem</em> easy to remember. </p> <h3>Question</h3> <p>How would I implement something similar for passwords? Yes, they ought to be hard to crack, but they also should be easy for the end user to remember. Combination Locks do that with a mix of numbers that have similar sounds, and with numbers that have similar properties (7-17-23: All Prime, 17 rolls right off the tongue after 7, and 23 is another prime, and is (out of that set), the 'hard' one to remember).</p> <h3>Criteria</h3> <ul> <li>The Password should be easy to remember. <code>Dog!Wolf</code> is easy to remember, but once an attacker knows that your website gives out that combination, it makes it infinitely easier to check.</li> <li>The words or letters should mostly follow the same sounds (for the most part).</li> <li>At least 8 letters</li> <li>Not use <code>!@#$%^&amp;*();'{}_+&lt;&gt;?,./</code> These punctuation marks, while appropriate for 'hard' passwords, do not have an 'easy to remember' sound. </li> </ul> <h3>Resources</h3> <p>This question is language-agnostic, but if there's a specific implementation for C#, I'd be glad to hear of it.</p> <h3>Update</h3> <p>A few users have said that 'this is bad password security'. <strong>Don't</strong> assume that this is for a website. This could just be for me to make an application for myself that generates passwords according to these rules. Here's an example. </p> <blockquote> <p>The letters <strong>A</strong>-<strong>C</strong>-<strong>C</strong>-<strong>L</strong>-<strong>I</strong>-<strong>M</strong>-<strong>O</strong>-<strong>P</strong> 'flow', and they happen to be two regular words put together (<strong>Acclimate</strong> and <strong>Mop</strong>). Further, when a user <em>says</em> these letters, or says them as a word, it's an actual word for them. Easy to remember, but hard to crack (dictionary attack, obviously).</p> </blockquote> <p>This question has a two-part goal:</p> <ol> <li>Construct Passwords from letters that sound similar (using alliteration) or</li> <li>Construct Passwords that mesh common words similarly to produce a third set of letters that is not in a dictionary.</li> </ol>
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    1. USGeorge Stocker
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    1. COThis seems way to subjective to ever get any kind of useful answer. EG: prime numbers make sense to math/programming geeks, but nobody else knows or cares about them. It'd likewise be similar for words/letters
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      1. USOrion Edwards
    2. CO@Orion Edwards: 'subjective' in TMTOWTDI? I'm not sure what is 'subjective' about the answer. Are there methods to do this, or aren't? If there are methods, how would we go about doing them? I'm not sure any of that is subjective; but feel free to respond with why it is subjective.
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    3. COThe more rules you have to your algorithm the more chance that the password can be brute forced. Disallowing characters totally diminishes the strength of any passwords generated.
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