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Generate strong yet memorable passwords
Authored by: tekfox on Sep 23, '04 01:33:21PM


I've been generating my passwords through a small Java utility that I wrote a few years ago. GenPasswd accepts a word of six characters or more and mangles it by inserting digits based on a simple algorithm. I use GenPasswd in combination with mnemonic phrases, such as: iamhungry or with foreign words. iamhungry, for example, becomes i8mhu5gr9.

The listing for the program is below.


Password generating utility version 1.0

© copyright 2001 Eugene Ciurana -- distribute as you see fit as long as you keep this copyright notice. @author Eugene Ciurana @version 1.0 */ public class GenPasswd extends Object { // *** Private and protected members *** private static void helpUser() { System.out.println("genpasswd: Too few arguments\n"); System.out.println("Syntax: genpasswd word1 word2 word3 ... wordN"); System.out.println(" wordN is a 6-letter (or more) string"); } // helpUser // *** Symbolic constants (public and private) ***** // *** Public methods *** // ***** Main program ***** public static void main(String[] argV) { if (argV.length == 0x00) helpUser(); for (int nLoop = 0x00;nLoop < argV.length;nLoop++) { if (argV[nLoop].length() < 0x06) System.out.print(argV[nLoop]+" -- word too short"); else for (int nInnerLoop = 0x00;nInnerLoop < argV[nLoop].length();nInnerLoop++) if (nInnerLoop == 0x01 || nInnerLoop == 0x05 || nInnerLoop == 0x08) System.out.print((nInnerLoop+argV[nLoop].charAt(nInnerLoop))%0x0a); else System.out.print(argV[nLoop].charAt(nInnerLoop)); System.out.println(); } } // main } // class GenPasswd

Use a text editor to create this file. When done, compile with javac:


To execute it, run:

java GenPasswd someword

I hope you find this useful.



Have you read The Sushi Eating HOWTO?

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Generate strong yet memorable passwords
Authored by: adrianm on Sep 23, '04 01:49:03PM
What's with all the hex constants and the useless extends Object ? Sorry, I just spent a day reviewing other people's java code - need to break the habbit :)

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Generate strong yet memorable passwords
Authored by: _merlin on Sep 23, '04 07:55:10PM

Remember that "foreign" words are only foreign to you.

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Generate strong yet memorable passwords
Authored by: ciurana on Sep 24, '04 05:14:43PM

merlin_ wrote:
> Remember that "foreign" words are only foreign to you.

Indeed. It might still be vulnerable to a dictionary attack; the mangling algorithm seems to do a decent job in creating mnemonic passwords, though. I usually go for phrases, though. Harder to nail them with a dictionary attack.


E (aka tek_fox)

San Francisco, CA USA

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