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OriginalGriff wrote:

I'm not good at throwing things away,

private static void Main(string[] args)
{
    //byte[] seek =  { 0xc5, 0x83, 0xc2, 0x8f, 0x2a, 0xaf, 0x42, 0x25 };
    byte[] seek = { 0x25, 0x42, 0xaf, 0x2a, 0x8f, 0xc2, 0x83, 0xc5 };

    byte[] message = new byte[8];

    for (int index = 0; index < 8; index++)
    {
        for (int c = 32; c < 127; c++)
        {
            message[index] = (byte)c;
            var test = BitConverter.GetBytes((encode(message)));

            if (test[7-index] == seek[7- index])
            {
                Console.WriteLine(Encoding.ASCII.GetString(message));
                Console.ReadLine();
            }
        }
    }

}

static ulong encode(string msg)
{
    ulong msg_bits = BitConverter.ToUInt64(Encoding.ASCII.GetBytes(msg), 0);
    return msg_bits ^ (msg_bits >> 3) ^ (msg_bits >> 13) ^ (msg_bits >> 47);
}

static ulong encode(byte[] msg)
{
    ulong msg_bits = BitConverter.ToUInt64(msg, 0);
    return msg_bits ^ (msg_bits >> 3) ^ (msg_bits >> 13) ^ (msg_bits >> 47);
}

Quote:

The message consists of two words and some punctuation...

x ^= x >> 3;