Magic 2015

"
Security:
-> Custom XOR Encryption

Additional:
Encryption is used for save and profile data.
"

private byte[] Decrypt(byte[] data) {
    for (int i = data.Length - 1; i > 0; --i)
        data[i] ^= data[i - 1];

    data[0] ^= data[data.Length - 1];
    return data;
}

private byte[] Encrypt(byte[] data) {
    data[0] ^= data[data.Length - 1];

    for (int i = 1; i < data.Length; ++i)
        data[i] ^= data[i - 1];

    return data;
}