Decrypt MD5

[khanhlq]

Can you Decrypt MD5 in c#. It's a difficult problem. Plz help me

[DJMaze]

Why and what you need to decrypt ?

[teknomage1]

in general no. yoou just take something you think is equivalent, generate the MD5 hash of that, and compare that with your original MD5. If they match you know what was encrypted.

[sde]

I like DJM's question I am curious.

[khanhlq]

Example I encrypt by:

private string encryptString(string strToEncrypt)
{
System.Text.UTF8Encoding ue = new System.Text.UTF8Encoding();
byte[] bytes = ue.GetBytes(strToEncrypt);

// encrypt bytes
System.Security.Cryptography.MD5CryptoServiceProvi der md5 = new System.Security.Cryptography.MD5CryptoServiceProvi der();
byte[] hashBytes = md5.ComputeHash(bytes);

// Convert the encrypted bytes back to a string (base 16)
string hashString = "";

for(int i=0;i<hashBytes.Length;i++)
{
hashString += Convert.ToString(hashBytes[i],16).PadLeft(2,'0');
}

return hashString.PadLeft(32,'0');
}

Now i want decrypt the password, but i can't write the best code. Please help me.

[teknomage1]

Just store the encrypted password, and when you ask the user again for the password, encrypt it with the same process. If the encrypted strings match, they entered the same password.

[khanhlq]

Have other way ? The way of teknomage1 same banana

[DJMaze]

Originally Posted by sde

I like DJM's question I am curious.

hehehe same frequencies

As tekno said: encrypt again

[teknomage1]

same banana?

[sde]

lol, banana

khanhlq: you can not decrypt md5. it is one-way encryption.

[khanhlq]

Just store the encrypted password, and when you ask the user again for the password, encrypt it with the same process. If the encrypted strings match, they entered the same password.

Send me the code and i'll try it and i found the lost pass. The pass use in database, i can see it(encrypted) but i don't remember the actual of pass.

[sde]

if you have access to the database, why don't you just md5 a new pass, and paste the encrypted string in the database so you know what your pass is.

[khanhlq]

But i want write a programme descrypt. Somebody written, plz send me. Thanks

[DJMaze]

time to lock this thread?

[redhead]

Done and done, since theres no way to decipher something that is a one way encryption, plus, the only place I could see use for something like that, would be in a direction towards password cracking, which we don't approve of here at Code Newbie.