Cryptography and Encryption

[tiger@xxxxxxxx (Tiger Quimpo)]

[On 04:45 PM 2/29/00 +0530, Biju Nambisan wrote]

>I am trying to encode the password using the MD5 algorithm thats
>provided with the jdk1.2.We also have a necessity to decrypt the
>password....Can somebody who has worked on this suggest the code 
>that goes in for decrypting.(We are interested in using MD5 for 
>decrypting as well)

you can't.  MD5 is a one way hash.  it can't be decrypted.

when you're dealing with passwords, you don't really need to 
decrypt anyway.  all you need to do is verify if the user
typed in a password now that is the same as the password he
specified the last time he changed his password.

for that, all you need to do is take the password he typed
now, run it through MD5, and compare the old hash with the
current hash.

--- heh, and then i read Rodrigo's reply.  apparently there
*is* a way to dec

tiger
-------------------------------------------------------------
Gerald Timothy Quimpo                *  entia non sunt multiplicanda
tiger at kami dot com                   praetere necessitatem
http://members.xoom.com/TigerQuimpo  *  mene sakhet ur-seveh


       Anything that is designed to do more than one thing can't
       do any of them well.


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