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  1. #1
    New Coder
    Join Date
    Mar 2006
    Thanked 0 Times in 0 Posts

    Question Is md5 can realy decrypted?

    I know that md5 is not encryption but algorithm. So it can't be reversed.
    But, some people claim that md5 can decrypted, like http://www.md5er.com/.

    Somebody can give me a fever about this? 'cause this makes me confuse.

    Thank you..

  • #2
    Senior Coder
    Join Date
    Aug 2003
    One step ahead of you.
    Thanked 3 Times in 3 Posts
    The short anwser is: No.
    I'm not sure if this was any help, but I hope it didn't make you stupider.

    Experience is something you get just after you really need it.
    PHP Installation Guide Feedback welcome.

  • #3
    Senior Coder CFMaBiSmAd's Avatar
    Join Date
    Oct 2006
    Denver, Colorado USA
    Thanked 339 Times in 331 Posts
    The claim of MD5 decoding involves databases of md5 values of common words or brute force using a dictionary of words. The web site at the link you posted is probably adding anything entered in the "encode" form to it's own database of MD5 values.

    You can protect against anyone "decoding" your md5 values by appending a random/nonsense "salt" string to the actual string to be encoded, and then performing the md5. This will insure that your MD5 value won't be found in any of these MD5 databases.
    If you are learning PHP, developing PHP code, or debugging PHP code, do yourself a favor and check your web server log for errors and/or turn on full PHP error reporting in php.ini or in a .htaccess file to get PHP to help you.


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