How I can decrypt a request parameter in md5 in a java servlet ?

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Hello Friends,

I have a web aplication with JSP pages and servlets.

I have a jsp page with a form with a password input, but when I clicked in the form button I send
the form elements in javascript function that open a new window calling a servlet.

the javascript function that open a new window, send the parameters to the servlet, but this parameters can be view in the navigation bar including the password.

I use an MD5 javacript function to encrypt my password and sending it to the sevlet, but I dont know how I recover my password from the servlet side. Because I encrypt my password from javascript side, but how I recover my password from my servlet side???

the md5 encrypt function (javascript) is form a md5.js library that I download from internet.

Please Anyone can help me??

Thanks in advance
Att:
Leonardo Ayala R.

Posted 30-Jun-13 18:09pm

leocode7

Updated 30-Jun-13 18:32pm

Thanks7872

v2

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Comments

H.Brydon 1-Jul-13 0:37am

I don't have a good answer for you but you shouldn't be using MD5 for new code any more. MD5 encryption has been broken now for more than 15 years.

Sergey Alexandrovich Kryukov 1-Jul-13 0:46am

That's correct, but this "broken" could potentially serve as the answer to the problem... if it could make any sense: cryptographic hash function is supposed to be bot reversible. And I cannot see the ways where reversing of hash could be legitimate.
—SA

Sergey Alexandrovich Kryukov 1-Jul-13 0:53am

Anyway, I provided a more detailed answer, please see.
—SA

leocode7 1-Jul-13 1:15am

I understand you, you have the reason, but please give me another alternative to send my password parameters in a safely mode, because it can be viewed in the navigation bar in my new window that is was opened. (I used the post method, but the url is visible because I opening in a new window, I need to hide my parameters anyway) please help me.

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Sergey Alexandrovich Kryukov · Answer 1 · 2013-06-30T18:52:00

Nobody is supposed to "recover a password", otherwise it would defeat one of the most important properties of the passwords. Passwords should not be recoverable, ever. If a password is lost, a brand new one should be created. I would say, the major purpose of password recovery would be committing a crime. Passwords in their original form is never needed for authentication. Also, passwords are never stored anywhere, but the cryptographic hash of a password can be stored with reasonable security.

Please see my past answers:
i already encrypt my password but when i log in it gives me an error. how can decrypte it[^],
Decryption of Encrypted Password[^],
storing password value int sql server with secure way[^].

Please also see the discussion in the comments to the question. H. Brydon is right: MD5 should never be used for security purposes.

—SA