How to convert encrypted password to decrypted in C# in windows application

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Hi
How to convert encrypted password to decrypted in C# in windows application

in my database table password was encrypted now i want to do decrypted.

Posted 18-May-12 2:01am

MAKReddy

Updated 29-Apr-17 2:04am

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Comments

Sunny_Kumar_ 18-May-12 8:08am

depends on the encryption method that you've used to encrypt the password. I suggest you to share the encryption method to get any help...

Timberbird 18-May-12 8:12am

Encrypt it. Seriously, you don't mention which encryption algorythm you used (maybe it's not even encryption but hashing), so who can help you? It sounds like "I broke arbitrary thing, how do I fix it?".
And why would you want your passwords decrypted, anyway?

__John_ 18-May-12 8:13am

Most encryption methods are non-orthogonal i.e they only go one way. So the answer is almost certanly, you cant do it.

2 solutions

Solution 2

By Using this piece of code you can encrypt your password written in the Textbox in asp.net application.

C#

String myPassword = this.txtpassword.Text;
HashAlgorithm mhash = new SHA1CryptoServiceProvider();
byte[] bytValue = System.Text.Encoding.UTF8.GetBytes(myPassword);
byte[] bytHash = mhash.ComputeHash(bytValue);
mhash.Clear();
this.rtxtpassword.Text = Convert.ToBase64String(bytHash);

try it & suggest.

Posted 26-Jul-12 19:28pm

Zubair F. Khan

Updated 26-Jul-12 19:42pm

v2

Comments

RAKESH CHAUBEY 19-Dec-12 1:08am

Thanks man /...Nice one

Member 12734006 29-Apr-17 8:33am

i wanted to encrypt the above textbox encrypted in itself. is it possible ? plz render the code . thanks

Dave Kreskowiak 29-Apr-17 11:29am

Don't resurrect a FIVE YEAR OLD question. Open your own question by going to the "quick answers" menu and clicking "Ask a question".

Chances are really good you're not going to get an answer from someone who hasn't posted anything in the last five years.

Your "question" also doesn't make any sense at all.

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Prasad_Kulkarni · Accepted Answer · 2012-05-18T02:10:00

Why you need to decrypt the password? Usually a salted hash of the password is stored and compared. If you encrypt/decrypt the password you have the password as plain text again and this is dangerous. The hash should be salted to avoid duplicated hash if the some users have the same passwords. For the salt you can take the user name.

C#

HashAlgorithm hash = new SHA256Managed();
string password = "12345";
string salt = "UserName";

// compute hash of the password
byte[] plainTextBytes = Encoding.UTF8.GetBytes(password);
byte[] hashBytes = hash.ComputeHash(plainTextBytes);

// create salted byte array
byte[] saltBytes = Encoding.UTF8.GetBytes(salt);
byte[] plainTextWithSaltBytes = new byte[plainTextBytes.Length + saltBytes.Length];
for (int i = 0; i < plainTextBytes.Length; i++)
{
   plainTextWithSaltBytes[i] = plainTextBytes[i];
}

// compute salted hash
byte[] saltedHashBytes = hash.ComputeHash(plainTextWithSaltBytes);
string saltedHashValue = Convert.ToBase64String(saltedHashBytes);

You can calculate the salted hash of the password and store that within your file. During the authentication you calculate the hash from the user entries again and compare this hash with the stored password hash. Since it should be very difficult (its never impossible, always a matter of time) to get the plain text from a hash the password is protected from reading as plain text again.

Tip: Never store or send a password unencrypted. If you get a new password, encrypt is as soon as possible!
Ref: stackoverflow.com

Please refer:
How To: Encrypt and Decrypt string Using C#[^]
How to encrypt and decrypt password in asp.net using C#?[^]

Some CP Articles:
Simple encrypting and decrypting data in C#[^]
Encrypt and Decrypt Data with C#[^]
Encrypt/Decrypt String using DES in C#[^]
Encryption and Decryption on the .NET Framework[^]