[zodehala]

PHP Code:

echo md5("zodehala"); //   = d6734f72e17eefa8abd6d2d43a81924b 

how can i encode "d6734f72e17eefa8abd6d2d43a81924b" ?

[UnrealEd]

encode? why would you want to encode an md5?

If you mean decode: you can't. md5 is not, as many people think, an encoding, but a hash. A hash is a one-way encoding: you can only encrypt the entered text, but never decrypt.

[zodehala]

like this
http://www.md5encryption.com/

[<?Wille?>]

Originally Posted by zodehala

like this
http://www.md5encryption.com/

thats nothing more then a database of known matches.

Everything i encrypted it was able to decrypt correctly, when i gave it a md5 of my favorite password it returned "Sorry, we could not find a matching decryption."

MD5 and SHA1 are both, as UnrealEd already said, inpossible to decode

[fyrestrtr]

They are not impossible to decode, but md5 has a collision which makes it less secure.

Although, for all practical purposes -- if you are running an application that people will try to hack (and spend the time and effort to find a powerful enough computer to find a collision) then you really shouldn't be using md5 in the first place

As mentioned about, md5 is not an encryption algorithm, it is a one-way hash. What this means is, md5 is a mechanism that when fed the same plain text, it will always generate the same cryptext (a collision, in plain terms, happens when two different plain texts generate the same cryptext).

To verify two unknowns, you run then through the md5 and check the cryptext. If it is the same, you know the plain text was the same.

You cannot get the plain text from the cryptext (that is why it is called one-way).

If you want two-way, then use a proper encryption algorigthm.

[lylesback2]

try this, when selecting the MD5 from the database

PHP Code:

WHERE username='$username' AND password=MD5('$password') 

[dotti]

Why make your own decoder...
Use someone elses on the web.
But if your trying to take from a database use lylesback2's little code.
Or you could make a script that generates matches of md5 hases and plain text

[zodehala]

not for db

just to know

i want to know how to MD5 decrypt ?

[Nico]

As everyone in this thread stated already, you can not decrypt MD5. It's not possible.

[benjamin247]

As stated by several people here, md5 is a hashing method and not an encoding method. Hashes are one-way whereas encoding is two ways.

Hypothetical Simple 2-way Encoding:
Method: Switch a with b, b with c,.... and switch z and a.
Result: "the quick brown fox" becomes "tif rvjdl cspxo gpy"
Decoding: Simply run the reverse function (a->z, b->a, c->b, etc).

Hypothetical Simple 1-Way Hash
Method: switch letters with numbers and multiply each letter in a word together. Then push the number-strings together and remove the zeros.
Result: "the quick brown fox" becomes:

-> (20x8x5) (17x21x9x3x11) (2x18x15x23x14) (6x15x24)

(combine strings)-> 8001060291738802160

(remove zeros) -> 8162917388216

Decoding: Data has been lost and is scrambled (precluding recovers) and there may be multiple strings that result in a 8162917388216 outcome. if I type in "the quick brown fox" it will always hash to 8162917388216 (so it's good to verify if someone has typed in a correct password) but you cannot reconstruct the string from the hash.