Что лучший способ состоит в том, чтобы зашифровать короткие строки в.NET?

TripleDES is a very good option, but you can also consider AesCryptoServiceProvider (AES), which is a modern symmetric cipher.

Here is encrypt & decrypt function with des3 encryption

''' <summary>
''' Encrypts a memory string (i.e. variable).
''' </summary>
''' <param name="data">String to be encrypted.</param>
''' <param name="key">Encryption key.</param>
''' <param name="iv">Encryption initialization vector.</param>
''' <returns>Encrypted string.</returns>
Public Shared Function Encrypt(ByVal data As String, ByVal key As String, ByVal iv As String) As String
    Dim bdata As Byte() = Encoding.ASCII.GetBytes(data)
    Dim bkey As Byte() = HexToBytes(key)
    Dim biv As Byte() = HexToBytes(iv)

    Dim stream As MemoryStream = New MemoryStream
    Dim encStream As CryptoStream = New CryptoStream(stream, des3.CreateEncryptor(bkey, biv), CryptoStreamMode.Write)

    encStream.Write(bdata, 0, bdata.Length)
    encStream.FlushFinalBlock()
    encStream.Close()

    Return BytesToHex(stream.ToArray())
End Function

''' <summary>
''' Decrypts a memory string (i.e. variable).
''' </summary>
''' <param name="data">String to be decrypted.</param>
''' <param name="key">Original encryption key.</param>
''' <param name="iv">Original initialization vector.</param>
''' <returns>Decrypted string.</returns>
Public Shared Function Decrypt(ByVal data As String, ByVal key As String, ByVal iv As String) As String
    Dim bdata As Byte() = HexToBytes(data)
    Dim bkey As Byte() = HexToBytes(key)
    Dim biv As Byte() = HexToBytes(iv)

    Dim stream As MemoryStream = New MemoryStream
    Dim encStream As CryptoStream = New CryptoStream(stream, des3.CreateDecryptor(bkey, biv), CryptoStreamMode.Write)

    encStream.Write(bdata, 0, bdata.Length)
    encStream.FlushFinalBlock()
    encStream.Close()

    Return Encoding.ASCII.GetString(stream.ToArray())
End Function

.net security classes:

Hash

* MD5
* MD5Cng
* SHA1
* SHA1Managed
* SHA1Cng
* SHA256
* SHA256Managed
* SHA256Cng
* SHA384
* SHA384Managed
* SHA384Cng
* SHA512
* SHA512Managed
* SHA512Cng

Symmetric Encryption: Uses the same key for encryption and decryption.

* DES
* DESCryptoServiceProvider
* TripleDES
* TripleDESCryptoServiceProvider
* Aes
* AesCryptoServiceProvider
* AesManaged
* RC2
* RC2CryptoServiceProvider
* Rijandel
* RijandelManaged

Asymmetric Encryption: Uses different keys for encryption and decryption.

* DSA
* DSACryptoServiceProvider
* ECDsa
* ECDsaCng
* ECDiffieHellman
* ECDiffieHellmanCng
* RSA
* RSACryptoServideProvider

You could just use RSA encryption, since these are short strings, which will make key exchange simpler.

How much you can encrypt with RSA is based on the key length.

I am a fan of the rsa library from bouncy castle.

На данный момент DES в значительной степени устарел. Вот Википедия . Если вы часто меняете ключ, этого может быть достаточно, но если вы какое-то время полагаетесь на ключ, AES кажется лучшим выбором.

Конечно, вопрос в том, какой уровень защиты вам нужен. Но AES тоже встроен прямо там.

Я использовал AES для небольших строк, и он отлично работает.

Что я читал о TripleDES, так это то, что, поскольку DES легко взломать, TripleDES по-прежнему несущественен.