PHP Code: Simple Encryption Algorithm

[Brandon W]

Oh so MD5 doesn't do something like that?

[Jordan]

MD5 is much more complex than this simple encryption algorithm.

[sautozoidas]

Thank you

[prakash1979]

thanks

[prakash1979]

How to decrypt the string any example ?

[Affix]

MD5 is a one-way hash algorithm, however, these encryption schemes above just move the ASCII value of a character. For instance, it will take the Char "a" and convert it to the ASCII value of 97, add 3 to it to make 100 and convert it back to a char (100 = d). It is a fairly simple encryption scheme and can be cracked fairly easy.

Sorry to disagree here but MD5 Is fairly simple to crack since the MD5 Algorythm Tables known as Rainbow Tables. I can crack a 24 char Pass encrypted with MD5 in around 43ms.

These tables do take up alot of diskspace with good table sets well over 500GB and possibly over 1TB. They take ages to generate also.

MD5 Usually gets salted now by Systems like IPB and vBulletin BUT they use the same method of salting

$pass = md5(md5($salt) . $postPass); 

Because this is public a brute force is fairly simple to do if you have access to the database.

[WingedPanther]

Note that brute force cracking of a hash is very different from "decrypting" it. Also, there is no guarantee that the Rainbow tables will generate the same pre-hash value as was actually used. For example, if "MyPass" and "YourPass" have the same MD5 hash, then when you "crack" the hash, you may use the opposite string from the one I chose.

[Jordan]

Agreed. Cracking it does not change the fact that it is one-way.

[rayyan]

really helpful
thanks

[t_qooze]

Can we encrypt/decrypt buffer or stream on the fly with this? And also is it possible to mix it with gzinflate/base63/str_rot13?