Use MD5 to encrypt the user password in the database (II) _ MySQL
Source: Internet
Author: User
Use MD5 to encrypt user passwords in databases (2) use MD5 to identify legal users
Since the user password is stored in the database after MD5 encryption, we know that MD5 is a single encryption algorithm, so it is impossible to convert the encrypted information into plaintext, that is, there is no way to know. This leads to a problem. if you use an account or password to log on, how can you know whether the password provided by the user is accurate?
This has to mention the MD5 feature we mentioned earlier. we know that after encryption of any segment of plaintext data, the results will never change. that is to say, to verify that the user password is correct, you only need to use MD5 encryption for the password currently provided by the user, and then compare it with the password field saved in the database. The following code implements this function:
<% @ Import Namespace = "System. Security. Cryptography" %>
<% @ Import Namespace = "System. Text" %>
<% @ Import Namespace = "System. Data" %>
<% @ Import Namespace = "System. Data. SqlClient" %>
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