encrypt / decrypt all your texts with Two-Key Triple DES
...Two-Key Triple DES is used to encrypt these messages. This algorithm performs 3 cryptographic processes on each block of information to reduce the penetration rate. The Abdal 2-Key Triple DES Builder tool has four modes for encrypting your data.
Crypto.Net is a free and open cryptography library for C# and .Net. AES (Rijndeal), Twofish, Blowfish, RSA, Diffie-Hellman, SSL/TLS, X509-Certificate builder, stream cipher modes or a secure netowrk stream are only some features of this library.