hello dear developers.

hi.

i have developed a c# application, it requires a username and a password for login to the application. but the passwords which users provide store in the database in plaintext.
so i want them to be encrypted when stored in database and decrypted when matched at the time of user login.

plz help me in this case.

thx in advance.

bye.

>so i want them to be encrypted when stored in database and decrypted when matched at the time of user login.

Use classes from System.Security.Cryptography namespace.

MD5 - Message digest example.

string text="samplepassword";
byte  []textByteArray=System.Text.Encoding.UTF8.GetBytes(text);

byte[] computeByteArray = System.Security.Cryptography.MD5.Create().ComputeHash(textByteArray);

//Convert "computerByteArray" into string so we can store into db

string md5Text = Convert.ToBase64String(computeByteArray);

MessageBox.Show(md5Text);

I posted a code snippet some time ago that uses encrypted passwords:
http://www.daniweb.com/code/post969838.html

MD5 is a checksum so you can't "reverse" the hash to arrive back at the original password. This is usually the preferred method of storing passwords. In my example I used reversible encryption.