Aes

Advanced Encryption Standard (AES) is a cryptographic block cipher algorithm.

Tripledes

Triple DES is a symmetric encryption algorithm that uses the DES cipher three times to encrypt each block of data

Others

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Aes from question AES decryption at Client side |

Des is a very weak algorithm you might want to think about aes rijndael;even tripledes from question How to implement System.Security.Cryptography.DES |

I personally would use aes for my encryption as it is lighter and from question TripleDESCryptoServiceProvider FIPS 140-2 Compliance |

But tripledes is from question Rfc2898DeriveBytes and TripleDes |