[430gj9j]

The key is the same length as the data, making this a one-time pad rather than XOR encryption. http://en.wikipedia.org/wiki/One-time_pad

[lucb1e]

"rather than XOR encryption."

Nobody never mentioned that it used xor..?

[squarelegs]

XOR encryption is a one-time pad encryption over an alphabet of two letters, you might be thinking of something like a Vigenère cipher applied to binary data.