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Asked: 2026-05-10T15:43:47+00:00

I’m trying to store a password in a file that I’d like to retrieve

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I’m trying to store a password in a file that I’d like to retrieve for later. Hashing is not an option as I need the password for connecting to a remote server for later.

The following code works well, but it creates a different output each time even though the key is the same. This is bad as when the application shuts down and restarts I won’t be able to retrieve my password any more. How can I store passwords in a file and retrieve them later?

public class EncyptDecrypt {      static System.Security.Cryptography.TripleDESCryptoServiceProvider keyProv = new System.Security.Cryptography.TripleDESCryptoServiceProvider();      public static System.Security.Cryptography.TripleDESCryptoServiceProvider KeyProvider {         get {             keyProv.Key = new byte[] { /* redacted with prejudice */ };             return keyProv;         }     }      public static string Encrypt(string text, SymmetricAlgorithm key) {          if (text.Equals(string.Empty)) return text;          // Create a memory stream.         MemoryStream ms = new MemoryStream();          // Create a CryptoStream using the memory stream and the         // CSP DES key.         CryptoStream encStream = new CryptoStream(ms, key.CreateEncryptor(), CryptoStreamMode.Write);          // Create a StreamWriter to write a string         // to the stream.         StreamWriter sw = new StreamWriter(encStream);          // Write the plaintext to the stream.         sw.WriteLine(text);          // Close the StreamWriter and CryptoStream.         sw.Close();         encStream.Close();          // Get an array of bytes that represents         // the memory stream.         byte[] buffer = ms.ToArray();          // Close the memory stream.         ms.Close();          // Return the encrypted byte array.         return System.Convert.ToBase64String(buffer);     }      // Decrypt the byte array.     public static string Decrypt(string cypherText, SymmetricAlgorithm key) {          if (cypherText.Equals(string.Empty)) return cypherText;          string val;          try {             // Create a memory stream to the passed buffer.             MemoryStream ms = new MemoryStream(System.Convert.FromBase64String(cypherText));              // Create a CryptoStream using the memory stream and the             // CSP DES key.             CryptoStream encStream = new CryptoStream(ms, key.CreateDecryptor(), CryptoStreamMode.Read);              // Create a StreamReader for reading the stream.             StreamReader sr = new StreamReader(encStream);              // Read the stream as a string.             val = sr.ReadLine();              // Close the streams.             sr.Close();             encStream.Close();             ms.Close();         }         catch (System.Exception) {              return string.Empty;         }          return val;     } }
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1 Answer

  1. I believe that what’s happening is that the crypto provider is randomly generating an IV. Specify this and it should no longer differ.

    Edit: You can do this in your ‘keyProvider’ by setting the IV property.

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