Visual Basic .Net AES-128 und AES-256-Verschlüsselung, File to Byte-Array, Byte-Array to File,

 AES-128 und AES-256-Verschlüsselung:

http://www.vbarchiv.net/tipps/tipp_2285-aes-128-und-256-bit-string-verschluesselung.html

File to Byte-Array:

http://www.example-code.com/vbdotnet/readFileIntoByteArray.asp
Byte-Array to File:
http://www.example-code.com/vbdotnet/save-byte-array.asp
How to: Convert an Array of Bytes into a String in Visual Basic:
https://msdn.microsoft.com/en-us/library/ms172827.aspx