MD5 encryption of data encryption

MD5 is a secure hashing algorithm with two features:
1, enter two different plaintext (a piece of raw digital information) will not get the same output value
2, according to the output value, can not get the original plaintext, that is, the process is irreversible
So to decrypt the MD5 there is no ready-made algorithm, can only use the poor lifting method, the possible clear text, with the MD5 algorithm hash, the resulting hash value and the original data form a one-on mapping table, and then in the so-called decryption, all through the mapping table to find its corresponding original plaintext.
There is absolutely no algorithm that can calculate the original plaintext by outputting the hashed value after the encryption.

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MD5 encryption is irreversible. So the data is already safe, the code is as follows

MD5CryptoServiceProvider in the namespace: System.Security.Cryptography;

1    #region=======MD5 Encryption ======2         /// <summary>3         ///MD5 Encryption4         /// </summary>5         /// <param name= "Sdatain" ></param>6         /// <returns></returns>7          Public Static stringGetMD5 (stringSdatain)8         {9MD5CryptoServiceProvider MD5 =NewMD5CryptoServiceProvider ();Ten             byte[] bytvalue, Bythash; OneBytvalue = System.Text.Encoding.UTF8.GetBytes (Sdatain +"Unity3d"); ABythash =Md5.computehash (bytvalue); - MD5. Clear (); -             stringStemp =""; the              for(inti =0; i < bythash.length; i++) -             { -Stemp + = Bythash[i]. ToString ("X"). PadLeft (2,'0'); -             } +             returnstemp.tolower (); -}

Of course, you can encrypt the original password several times with MD5. Is it more secure?

1 /// <summary>2         ///Login entry for password encryption, encrypted password: s+md5 (S+MD5 (pwd))3         /// </summary>4         /// <param name= "pwd" >password entered by the user or user password stored in the database</param>5         /// <param name= "S" >randomly generate a two-bit letter: s, or you can specify the letter yourself</param>6         /// <returns></returns>7          Public Static stringEntry (stringPwdstrings)8         {9             if(string. IsNullOrEmpty (s))Ten             { OneRandom Randmon =NewRandom (); As = ((Char) Randmon. Next ( $, the)). ToString () + ((Char) Randmon. Next ( $, the)). ToString (); -             } -             returnS + GetMD5 ((s +GetMD5 (pwd )); the}

Then call entry directly ("Unity3d", "AB");

MD5 encryption of data encryption