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Password Masher - Make unique complex passwords per domain from simple local passwords - open javascript

pwdmasher.html - (public version - modify to make private)

Password Masher generates secure passwords by mashing together domain name and a normal simple password to create domain-unique, strong passwords. For instance password12 might be converted to 3L*rTufI=pXA2lMnVB6lNsWAxGhLp~bK

This means no website or domain ever has the same password on file, and easy to remember, simple passwords can be used locally on pwdmasher without those passwords being exposed externally.

** Security in use **

For security, this should be downloaded and then run as a local file via your browser (eg file:///home/pwdmasher.html ). Bookmark it for ease of access.

This file makes NO CONNECTION to the internet. You can confirm this with network viewer under Web Development tools on your browser.

All code is open (no external or obfuscated files) and can be inspected below. Verify there is no outbound internet element and double check with Network Inspector that no outbound connections are made.

** Personalisation **

The code here should be personalised for additional security

  • dateofbirth, schoolname, MD5seed1, MD5seed2 can be modified freely (they act as seeds to the hashing function)

  • for coders, additional 'blendtype' strings can be added into blendit function and selected with the blendtype variable

  • the hash and blend method can be used in other programming languages or applications to produce identify output. We like the openness of Javascript on an HTML page because it is easily inspected and verified

  • for developers you could extend this to add a hash to the login URL and then mash this too, to provide a unique password per visit

** Validation **

With original settings, output from and password:1234 is zi+vf5p!tb0E7M?XByjQq?vAdHhO@s#Z

If you do personalise the code, remember to keep a backup copy and a test output.

Copyright 2017 Saul Dobney (

This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.


Password Masher - Make unique complex passwords per domain from simple local passwords - open javascript







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